Rover 623 GSi (1994-99)

Overview:  The **Rover 623 GSi**, introduced in 1994, held considerable strategic significance for Rover at a pivotal moment in its history. It wasn’t just a top-spec saloon—it was a **statement of intent**. Here's why it mattered:

 🧭 Strategic Importance to Rover

- **Flagship of the 600 Series**  

  - The 623 GSi was the **luxury pinnacle** of the Rover 600 range, showcasing the brand’s ambition to compete in the **compact executive segment** alongside BMW, Audi, and Volvo.

- **Showcase of the Honda Partnership**  

  - It embodied the **best of Rover-Honda collaboration**: a British-designed body and interior paired with the **refined 2.3L Honda H23A3 engine** and automatic transmission.  

  - This synergy gave Rover a reputation for **reliability and smoothness**—a major step forward from earlier perceptions.

- **Brand Repositioning**  

  - The 623 GSi helped reposition Rover as a **premium marque**, distancing itself from its volume-car roots (e.g. Montego) and aligning more with **aspirational buyers**.

- **Interior Craftsmanship**  

  - With **leather upholstery**, **burr walnut trim**, and a **quiet, refined ride**, it reinforced Rover’s image as the purveyor of **“British luxury at a sensible price.”**

- **Bridge to the Rover 75**  

  - It laid the groundwork for the **Rover 75**, which would later become the brand’s flagship under BMW ownership. The 623 GSi proved Rover could build a car that **looked and felt premium**, even if it wasn’t entirely homegrown.

🧠 Legacy

While not a global bestseller, the 623 GSi was arguably **Rover’s most refined saloon of the 1990s**. It gave the company credibility in a segment it had long struggled to crack and remains a **symbol of what Rover could achieve** when design, engineering partnerships, and market positioning aligned.

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COMMON FAULTS

The **Rover 623 GSi (1994–99)** was generally well-regarded for its Honda-sourced reliability, but like any aging executive saloon, it had its share of recurring issues. Here’s a breakdown of the most common faults reported by owners and specialists:

 🔧 **Engine & Cooling**

- **Coolant Leaks**  

  - Often from the **radiator**, **heater matrix**, or **water pump**  

  - Expansion tanks and hoses can become brittle with age  

  - Some owners reported gradual coolant loss without visible leaks

- **Timing Belt & Water Pump**  

  - Critical to replace at recommended intervals (~60,000 miles or 5 years)  

  - Failure can result in **catastrophic engine damage**

- **Idle & Throttle Issues**  

  - Hesitation or poor throttle response linked to **throttle position sensor (TPS)** or **stepper motor** wear

 ⚙️ **Transmission & Drivetrain**

- **Auto Gearbox (4-speed Honda unit)**  

  - Generally reliable, but fluid must be changed regularly  

  - Harsh shifting or slipping can occur if neglected

- **Driveshaft CV Joints**  

  - Can wear prematurely, especially on high-mileage or poorly maintained cars

 ⚡ **Electrical & Sensors**

- **ABS Faults**  

  - Commonly due to **wheel speed sensors** or **ABS control module** failure  

  - Replacement modules can be expensive; used parts may be viable

- **Fuel Pump Relay & Electrical Gremlins**  

  - Intermittent starting or stalling traced to **fuel pump relay** or corroded connections

🛞 **Suspension & Brakes**

- **Worn Suspension Bushes & Dampers**  

  - Leads to vague handling and uneven tyre wear  

  - Front wishbones and rear trailing arms are common culprits

- **Brake Caliper Seizure**  

  - Especially on cars laid up for long periods  

  - Rear calipers prone to sticking

 🧰 **Other Age-Related Issues**

- **Rust**  

  - Rear arches, sills, and subframes can corrode if untreated  

  - Underside checks are essential on long-stored examples

- **Interior Trim Wear**  

  - Leather seats and walnut trim can crack or delaminate  

  - Sunroof drains may block, leading to damp carpets

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Generations/Trim Levels

The **Rover 623 GSi** belonged to a **single generation**—as part of the **Rover 600 Series**, produced from **1993 to 1999**. It was introduced in **1994** as the **luxury flagship** of the range and remained in production until the end of the model line.

 🧬 **Generations**

- **One generation only** (1994–1999), based on the **Honda Accord (CB platform)**  

- No major redesigns, but it received **two mild facelifts**:

  - **1996 update**: revised interior, improved security, air conditioning standard

  - **1997 update**: body-coloured trim, lowered suspension, minor cosmetic tweaks

 🚗 **Trim Levels for the 2.3L Models**

The 2.3L Honda H23A3 engine was offered in **three main trims**:

1. **Rover 623 GSi**  

   - Luxury-focused automatic  

   - Full leather, walnut trim, cruise control, 15" alloys  

   - Air conditioning standard from 1995 onward

2. **Rover 623 iS**  

   - Sportier manual version  

   - Half-leather, boot spoiler, firmer ride  

   - Dropped around 1995 in favour of the 620Ti

3. **Rover 623 SLi**  

   - Mid-range comfort trim  

   - Windsor fabric, ABS, electric rear windows  

   - Briefly filled the gap after the iS was dropped

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Designer/Dimensions

The **Rover 620 GSi** was designed by **Richard Woolley**, Rover’s in-house designer, who was also responsible for the Rover 75 and several other key models. While the 600 Series was based on the **Honda Accord (CB platform)**, Woolley and his team gave it a distinctively British identity through unique exterior styling, interior trim, and detailing.

 📏 **Dimensions of the Rover 620 GSi**

- **Length**: 4,650 mm  

- **Width**: 1,727 mm  

- **Height**: 1,380 mm  

- **Wheelbase**: 2,720 mm  

- **Kerb Weight**: ~1,280–1,365 kg  

- **Boot Capacity**: ~430 litres  

- **Turning Circle**: 11 metres

These proportions gave the 620 GSi a sleek, understated saloon profile—longer and lower than many rivals—while maintaining a spacious cabin and refined ride. 

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Where Manufactured

The **Rover 620 GSi** was manufactured in the **United Kingdom**, specifically at **Plant Oxford in Cowley, Oxford, England**.

This facility was a key production site for Rover during the 1990s and handled assembly of the entire 600 Series range. While the car was based on the Honda Accord platform, Rover’s design team—led by Richard Woolley—gave it a distinct British identity, and final assembly was entirely UK-based.

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Production Total

The total production of the **Rover 600 Series**, which includes the **620 GSi**, was approximately **272,512 units** between **1993 and 1999**. While Rover did not publish a breakdown by individual trim level, the 620 GSi was one of the more popular mid-to-high-spec variants, especially in the mid-1990s.

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Price New

In **1994**, the **Rover 620 GSi** had a UK list price of approximately **£18,995**. This positioned it as a well-equipped executive saloon offering strong value against rivals like the BMW 3 Series and Audi 80.

By comparison:

- The **BMW 318i SE** started around £17,500  

- The **Audi 80 2.0E** was priced near £18,000  

- The **Ford Mondeo Ghia 2.0i** came in closer to £16,000

The 620 GSi’s appeal lay in its **luxury trim (leather, walnut, alloys)** and **refined Honda-sourced drivetrain**, making it a compelling alternative for buyers seeking understated comfort and reliability.

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Sales

The **Rover 620 GSi** was a *moderate success* in the UK market but **not a runaway bestseller**. Here's how its sales performance stacks up in context:

 📈 **UK Market Performance**

- The **Rover 600 Series** as a whole sold **over 272,000 units** between 1993 and 1999.

- The **620 GSi** was one of the more popular trims, especially in the mid-1990s, thanks to its blend of **luxury features and Honda reliability**.

- It appealed strongly to **company car drivers** and **private buyers** seeking understated executive comfort without the premium badge price.

 🌍 **International Sales**

- Outside the UK, the 620 GSi had **limited traction**.  

  - In Europe, it was overshadowed by rivals like the BMW 3 Series and Audi A4.  

  - It was **not sold in North America**, and had minimal presence in Asia-Pacific markets.

 🧠 Verdict

The 620 GSi was **a quiet achiever**—respected for its refinement and reliability, but never a volume leader. It helped **reposition Rover as a credible premium contender**, especially in the UK, but lacked the global reach or brand cachet to become a blockbuster.

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Highest Sales Figures by Country

The **Rover 620 GSi** achieved its **highest sales figures in the United Kingdom**, which was by far its strongest market. Here's how its sales footprint looked:

 🌍 **Top Countries by Sales (Estimated)**

1. **United Kingdom**  

   - Core market with the majority of the 272,512 total Rover 600 Series units sold  

   - Popular among company car drivers and private buyers seeking understated executive comfort  

   - Strong dealer network and brand loyalty helped sustain sales

2. **Germany**  

   - Modest success, appreciated for Honda reliability and British styling  

   - Faced stiff competition from domestic brands like BMW and Audi

3. **Netherlands & Scandinavia**  

   - Small but steady presence, especially among buyers valuing refinement and value  

   - Often sold in SLi or GSi trims with automatic gearboxes

4. **Ireland**  

   - Limited numbers, but the 620 GSi found favour with private buyers and ex-UK imports

 🧠 Summary

The 620 GSi was a **regional success**, with the UK accounting for the lion’s share of sales. It never reached North America or gained significant traction in Asia-Pacific, where the Honda Accord dominated.

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Historical Pricing Comparisons

Here’s a snapshot of **historical pricing trends** for the *Rover 620 GSi* in the UK, based on auction data and enthusiast platforms:

 💷 **Historical Price Points**

- **1994 (New)**:  

  - List price: **£18,995**  

  - Positioned competitively against the BMW 318i SE (~£17,500) and Audi 80 2.0E (~£18,000)

- **Early 2000s (Used Market)**:  

  - Typical resale: **£2,000–£4,000** depending on condition and mileage  

  - Depreciation was steep, as with most executive saloons of the era

- **2010s (Modern Classic Emergence)**:  

  - Values bottomed out: **£500–£1,200** for running examples  

  - Many were scrapped or exported, reducing the survivor pool

- **2020–2025 (Classic Reappraisal)**:  

  - Auction median: **£1,456**  

  - Highest recorded sale: **£1,760**  

  - Lowest recorded sale: **£900**  

  - Sell-through rate: **83%**, indicating steady demand

 📈 **Market Insight**

- The 620 GSi is now seen as a **budget-friendly modern classic**, with values slowly rising due to rarity and nostalgia.

- Survivors in **original condition with low mileage** are increasingly sought after by collectors and Rover enthusiasts.

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Main Rivals (Performance)

Here's the **performance comparison** between the **Rover 623 GSi** and its main mid-1990s rivals:

 🚗 **Rover 623 GSi (1994–1999)**

- **Engine**: 2.3L Honda H23A3 I4  

- **Power**: 158 PS (156 bhp)  

- **Torque**: 206 Nm  

- **0–60 mph**: 9.5–9.8 seconds (automatic)  

- **Top Speed**: 134 mph  

- **Drive**: Front-wheel drive  

- **Character**: Smooth, refined cruiser with emphasis on comfort

 🆚 **Main Rivals**

- **BMW 320i (E36)**  

  - 2.0L Inline-6  

  - ~150 bhp  

  - 0–60 mph: ~9.0 sec  

  - Top Speed: 133 mph  

  - Rear-wheel drive with sharper handling

- **Audi 80 2.6E**  

  - 2.6L V6  

  - ~150 bhp  

  - 0–60 mph: ~9.2 sec  

  - Top Speed: 134 mph  

  - Known for solid build and quattro option

- **Ford Mondeo 2.0 Ghia**  

  - 2.0L Inline-4  

  - ~136 bhp  

  - 0–60 mph: ~9.8 sec  

  - Top Speed: 127 mph  

  - Front-wheel drive, more mainstream

- **Peugeot 406 2.0 SV**  

  - 2.0L Inline-4  

  - ~135 bhp  

  - 0–60 mph: ~10.0 sec  

  - Top Speed: 125 mph  

  - Comfort-oriented with French flair

- **Honda Accord 2.2i ES**  

  - 2.2L I4 VTEC  

  - ~150 bhp  

  - 0–60 mph: ~8.9 sec  

  - Top Speed: 134 mph  

  - Technically closest to the Rover 623 GSi

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Engine

The **Rover 623 GSi** was powered by the **Honda H23A3** engine—a smooth, naturally aspirated inline-four that delivered refined performance and reliability. Here’s a detailed breakdown of its specification:

 🛠️ **Engine Specification: Rover 623 GSi (1994–1999)**

- **Engine Code**: Honda H23A3  

- **Displacement**: 2,259 cc (2.3 litres)  

- **Configuration**: Inline-4, DOHC, 16 valves  

- **Fuel System**: Multi-point fuel injection  

- **Aspiration**: Naturally aspirated  

- **Compression Ratio**: 9.8:1  

- **Power Output**: 158 PS (156 bhp) @ 5,800 rpm  

- **Torque**: 206 Nm (152 lb-ft) @ 4,500 rpm  

- **Redline**: ~6,500 rpm  

- **Engine Layout**: Transverse, front-mounted  

- **Drive**: Front-wheel drive  

- **Transmission**: 4-speed automatic (standard), 5-speed manual (in 623iS variant)  

- **Fuel Type**: Petrol  

- **Oil Capacity**: 5.4 litres (recommended 10W-40)  

- **Cooling System**: Water-cooled, 7-litre capacity

 🔧 Notable Characteristics

- **Smooth and quiet** thanks to Honda’s engineering focus on NVH (noise, vibration, harshness)

- **Chain-driven camshaft** for long-term durability

- **Low maintenance** reputation—timing belt and water pump service intervals were key

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Historical Advertisements & Marketing Strategy

The **Rover 623 GSi** was marketed as a refined, understated executive saloon that blended **British luxury with Japanese engineering**. Its advertising and marketing strategy in the mid-1990s reflected Rover’s ambition to reposition itself as a premium brand without alienating its traditional customer base.

 📺 **Advertising Themes**

- **“British Sophistication Meets Japanese Precision”**  

  - Campaigns emphasized the Rover’s **leather and walnut interior**, contrasting it with the mechanical reliability of its **Honda-sourced drivetrain**.

  - Print ads often featured elegant, moody photography with taglines like *“Luxury, without the price of a badge”* or *“The thinking man’s executive car.”*

- **Refined, Not Flashy**  

  - TV and magazine ads avoided aggressive performance claims. Instead, they focused on **quietness, comfort, and craftsmanship**—positioning the 623 GSi as a more tasteful alternative to the BMW 3 Series or Audi 80.

- **Interior as a Selling Point**  

  - Reviews and brochures highlighted the **“perfume of well-fed leather”** and **mirror-finish burr walnut**, presenting the cabin as a sanctuary of British elegance.

 🎯 **Marketing Strategy**

- **Target Audience**:  

  - Aimed at **middle-class professionals**, **company car drivers**, and **empty-nesters** seeking comfort and reliability without ostentation.

- **Positioning**:  

  - Marketed as a **British BMW alternative**, offering similar refinement at a lower price point.

  - Leveraged Rover’s **heritage and craftsmanship** while downplaying its Honda underpinnings.

- **Pricing Strategy**:  

  - Priced around **£21,995 in 1994**, undercutting German rivals while offering more standard equipment.

- **Dealer Experience**:  

  - Rover showrooms emphasized **personal service**, **test drive comfort**, and **British hospitality**—a subtle nod to the brand’s genteel image.

 🧠 Legacy

The 623 GSi’s marketing helped **rebuild Rover’s premium image** during a critical period. While it never achieved global fame, it succeeded in **redefining Rover’s domestic reputation** as a maker of refined, reliable saloons.

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Rarity & Collector Appeal

The **Rover 623 GSi** is becoming an increasingly rare and intriguing modern classic, with growing appeal among collectors who appreciate understated luxury and 1990s British-Japanese collaborations. Here's a breakdown of its rarity and collector status in 2025:

🔍 **Rarity**

- **Survivor Numbers**: Fewer than **60 licensed examples** remain on UK roads, with a slightly higher number on SORN (Statutory Off Road Notification).

- **Low Visibility**: It's now uncommon to see one at classic car shows or even in enthusiast circles—making a clean example a genuine talking point.

- **Trim-Specific Scarcity**: The 623 GSi, being the top-spec automatic, is rarer than the more common 620 SLi or 618i variants.

🏆 **Collector Appeal**

- **Understated Luxury**: Leather, walnut, and Honda-sourced refinement make it a sleeper hit among those who value comfort over flash.

- **Period Charm**: With its burr walnut trim, deep-pile carpets, and smooth drivetrain, it captures a very specific 1990s executive aesthetic.

- **Reliable Engineering**: The Honda H23A3 engine is known for its durability, making it a practical classic for regular use.

- **Design Legacy**: Styled by Richard Woolley, the 600 Series is praised for its elegant proportions and subtle detailing.

- **Nostalgia Factor**: For those who grew up in the 1990s, the 623 GSi represents a time when Rover was quietly competing with BMW and Audi.

 📈 **Market Outlook**

- **Current Values**: £1,000–£2,000 for good examples; concours cars may fetch more.

- **Appreciation Potential**: Modest but steady—especially for low-mileage, original-spec cars with full history.

- **Future Classic Status**: Increasingly recognised by classic car media and clubs as a “forgotten gem” worth preserving.

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Recorded in UK 2025

As of **2025**, there are approximately **10 Rover 623 GSi models licensed for road use** in the UK, with an additional **32 recorded as SORN (Statutory Off Road Notification)**. That brings the total known survivor count to **42 vehicles**.

This marks a dramatic decline from the model’s peak in **2000**, when over **1,260 examples** were on the road. The sharp drop reflects both natural attrition and the car’s once-overlooked status in the classic market.

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Target Age Group:

The **Rover 623 GSi** was primarily targeted at **middle-aged professionals**, typically in the **35–55 age range**, when it launched in the mid-1990s. Here's how that breaks down:

🎯 **Target Demographic Profile (1994–1999)**

- **Age Group**: 35–55 years  

- **Occupation**: Middle to upper management, professionals, company car drivers  

- **Lifestyle**:  

  - Valued **refinement and comfort** over outright performance  

  - Preferred **understated luxury** to flashy branding  

  - Likely to have previously owned a Montego, Ford Granada, or early BMW 3 Series

- **Buying Motivation**:  

  - Wanted a **premium-feeling saloon** without the cost of a German badge  

  - Trusted **Honda reliability** but appreciated **British design and trim**  

  - Often influenced by **company car tax bands** and **fleet deals**

🧠 Marketing Insight

Rover positioned the 623 GSi as the **“thinking person’s executive car”**—a refined, well-equipped alternative to the BMW 320i or Audi 80, aimed at buyers who valued **comfort, craftsmanship, and quiet confidence**.

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Influence of Target Age Group

The **target age group** for the Rover 623 GSi—primarily **35 to 55-year-old professionals** in the mid-1990s—had a significant influence on the car’s **design, features, and marketing strategy**. Here's how that demographic shaped the model:

 🧠 **Design & Engineering Influence**

- **Refined, not sporty**: Prioritised comfort, quietness, and smooth automatic transmission over aggressive handling or performance.

- **Interior luxury**: Full leather, burr walnut trim, and soft-touch materials catered to mature tastes and expectations of executive refinement.

- **Ease of use**: Features like cruise control, automatic gearbox, and electric seat adjustment reflected a desire for convenience and comfort.

📣 **Marketing & Brand Positioning**

- **“The thinking person’s executive car”**: Ads appealed to buyers who valued substance over status—those who might avoid flashier German rivals.

- **Professional image**: Targeted at middle managers and company car drivers who wanted to project success without ostentation.

- **Heritage appeal**: Leveraged Rover’s British identity and craftsmanship to resonate with buyers nostalgic for traditional values.

 💼 **Sales & Specification Strategy**

- **Fleet-friendly**: Trim levels and pricing were structured to appeal to company car schemes and tax-conscious professionals.

- **Standard equipment**: High spec as standard (e.g. ABS, air con, leather) reduced decision fatigue for time-poor buyers.

- **Automatic transmission**: Popular with older buyers and urban professionals seeking a relaxed driving experience.

🧭 Long-Term Impact

- The car’s **understated character** and **reliability** made it a favourite among loyal Rover customers, but limited its appeal to younger or more performance-oriented drivers.

- Today, its **collector appeal** is strongest among those who were in their 30s or 40s when it launched—many of whom now seek it out for nostalgic reasons.

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Parts Bin Engineering

The **Rover 623 GSi** is a fascinating case of *parts-bin engineering done with intent*. While it was based on the Honda Accord platform, Rover’s engineers and designers selectively blended **Honda mechanicals** with **Rover-specific components** to create a car that felt distinctively British. Here's how the parts-bin strategy played out:

 🔧 **Honda-Sourced Components**

- **Engine & Transmission**:  

  - 2.3L Honda H23A3 engine  

  - 4-speed automatic gearbox (Honda design)  

  - Engine mounts, ECU, and cooling system also Honda-derived

- **Suspension & Brakes**:  

  - Double-wishbone front suspension and rear trailing arm setup from the Accord  

  - Brake calipers, master cylinder, and ABS system shared with Honda

- **Electrical & Sensors**:  

  - Alternator, starter motor, and many sensors (e.g. TPS, MAP, ABS) were Honda parts  

  - Fuse boxes and relays often stamped with Honda part numbers

 🏷️ **Rover-Specific Components**

- **Body Panels & Styling**:  

  - Unique front and rear bumpers, grille, and light clusters  

  - Distinctive Rover bonnet and bootlid pressings

- **Interior Trim**:  

  - Full leather seats, burr walnut dashboard, and Rover switchgear  

  - Instrument cluster and HVAC controls were Rover-specific

- **Brand Identity**:  

  - Badging, wheel designs, and colour palettes (e.g. Nightfire Red, British Racing Green) were exclusive to Rover

 🧠 **Why It Mattered**

- This hybrid approach allowed Rover to **reduce development costs**, **improve reliability**, and **accelerate time to market**.

- It also gave the 623 GSi a **refined driving experience** with the **reliability of Honda** and the **ambience of a British executive saloon**.

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Spares

For sourcing **Rover 623 GSi** spares in the UK or Ireland, you're in luck—there are several reliable options catering to both new and used parts, including Honda-compatible components. Here's a curated list:

 🧰 **Specialist Rover Parts Suppliers**

- **[StillMotoring.co.uk](https://editor.wix.com/html/editor/web/renderer/edit/a7b51f1b-dd38-43df-8e20-be5da5f120fd?metaSiteId=1e42b07e-938b-45de-8696-96ffc623a942)**  

  - Enthusiast-run site with a focus on Rover 600 Series  

  - Offers hard-to-find trim, electricals, and interior parts  

  - Particularly useful for original-spec restoration

- **[1stChoice.co.uk](https://www.1stchoice.co.uk/car-parts/rover/600/4-door-saloon/2.3-623-gsi)**  

  - Aggregates stock from over 150 UK breakers  

  - Search by reg or model for instant quotes on used parts  

  - Great for items like ECUs, gearboxes, and body panels

- **[BreakerLink.com](https://www.breakerlink.com/cars/rover/600/)**  

  - Free parts-finder service across UK and Irish breakers  

  - Covers everything from window regulators to full engines  

  - Offers delivery and warranty options

 🛒 **Online Retailers & Catalogues**

- **[BuyCarParts.co.uk](https://www.buycarparts.co.uk/rover/600-rh/4012)** and **[Autodoc.co.uk](https://www.autodoc.co.uk/spares/rover/600/600-rh/4012-623-si)**  

  - Stock new OE-spec parts for the 623 GSi (filters, brakes, suspension)  

  - Honda Accord (CB) compatibility often applies—especially for engine and drivetrain

- **[eBay UK](https://www.ebay.co.uk/shop/rover-623-gsi?_nkw=rover+623+gsi)**  

  - Excellent for rare trim, brochures, and NOS (new old stock) items  

  - Watch for sellers parting out full cars—often a goldmine for interior and electrical bits

 🧠 **Tips for Efficient Sourcing**

- **Cross-reference Honda Accord CB parts** (1993–97) for mechanicals like alternators, sensors, and suspension

- **Join Rover 600 forums and Facebook groups**—members often have spares or leads on breakers

- **Check Irish classic car pages** for local sellers or import-friendly yards

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Manufacturer Recommended

Engine Oil: The **factory-recommended engine oil** for the *Rover 623 GSi* was typically a **10W-40 semi-synthetic** oil meeting the following specifications:

- **API SH** or higher  

- **CCMC G4** or **RES.22.0LG4** (Rover’s internal spec)  

- Suitable for **moderate UK climates** and long service intervals

This recommendation applied to all Honda-engined Rover 600 models, including the 2.3L H23A3 unit in the 623 GSi.

🛢️ **Modern Equivalent Oils (2025)**

For today’s use—especially in classic preservation or regular driving—these are excellent modern substitutes:

- **Millers Oils Trident 10W-40 Semi-Synthetic**  

  - Designed for older petrol engines  

  - Excellent shear stability and anti-wear protection

- **Castrol GTX Ultraclean 10W-40**  

  - Widely available, meets API SN/CF  

  - Good detergent package for older engines

- **Comma XTech 10W-40**  

  - Budget-friendly, meets ACEA A3/B4  

  - Suitable for high-mileage engines

- **Shell Helix HX7 10W-40**  

  - Blended for smooth cold starts and sludge protection  

  - Trusted for Honda-based engines

 🧠 Notes for Classic Use

- **Avoid 5W-30 or 0W-20** unless operating in extreme cold—these are too thin for the H23A3 in UK/Ireland climates and may increase wear.

- **Change interval**: Every **6,000–10,000 miles** or **12 months**, whichever comes first.

- **Oil capacity**: ~4.3 litres (service fill), ~5.4 litres (dry fill)

**

Transmission Oil: For the **Rover 623 GSi** (1994–1999), which used the **Honda H23A3 engine** and a **4-speed automatic transmission**, the factory originally recommended:

 🛢️ **Factory-Recommended Transmission Fluid**

- **Honda ATF-Z1**  

  - This was the OEM fluid specified by both Honda and Rover for the automatic gearbox  

  - Known for its smooth shifting characteristics and compatibility with Honda-designed transmissions

 🔄 **Modern Equivalents (2025)**

Since **ATF-Z1** is now discontinued, the following are widely accepted modern substitutes:

- **Honda ATF-DW1**  

  - Official replacement for ATF-Z1  

  - Backward-compatible and widely available through Honda dealers  

  - Slightly thinner for improved fuel economy, but generally safe for older boxes

- **Fuchs Titan ATF 4400**  

  - High-quality multi-vehicle ATF compatible with Honda Z1/DW1 specs  

  - Known for smooth operation and thermal stability

- **Comma AQ3 or MVATF Plus**  

  - Budget-friendly options meeting Honda ATF-Z1 compatibility  

  - Available across the UK and Ireland

- **Ravenol ATF Type H**  

  - Specifically formulated for older Honda automatics  

  - Meets Z1 performance characteristics

 ⚠️ **Important Notes**

- **Avoid Dexron II/III**: These were sometimes listed in early manuals but are *not* suitable for long-term use in Honda-based transmissions—only for emergency top-ups.

- **Change Interval**: Every **30,000–40,000 miles** or **3–4 years** is ideal for preserving shift quality.

- **Capacity**: Approx. **2.4 litres** for a drain-and-fill; full flush requires ~6 litres

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Spark Plugs: For the **Rover 623 GSi**, which used the **Honda H23A3 2.3L DOHC engine**, the factory-recommended spark plugs were typically:

 🔧 **Factory-Recommended Spark Plugs**

- **NGK ZFR6F-11**  

  - Standard copper-core plug  

  - Pre-gapped to **1.1 mm**  

  - Designed for smooth combustion and longevity in Honda-based engines

- **Denso K20PR-U11**  

  - Equivalent to the NGK plug  

  - Also gapped to **1.1 mm**  

  - Offers similar heat range and performance characteristics

 🆕 **Modern Equivalents (2025)**

These updated plugs maintain compatibility while offering improved materials and durability:

- **NGK ZFR6FIX-11** *(Iridium)*  

  - Longer lifespan and better ignition stability  

  - Ideal for classic car owners seeking reduced maintenance

- **Denso IK20TT** *(Iridium Twin-Tip)*  

  - Enhanced cold starts and fuel efficiency  

  - Excellent for daily-driven classics

- **Bosch FR7DCX+** *(Copper core)*  

  - Budget-friendly alternative  

  - Ensure correct gap before fitting (1.1 mm)

 🧠 Tips for Fitment

- Always **check and adjust the gap** to 1.1 mm if needed  

- Avoid over-tightening—use a torque wrench if possible  

- Replace every **30,000–40,000 miles** for copper plugs, or **60,000–100,000 miles** for iridium

**

Tyres: The **factory-recommended tyre size** for the *Rover 623 GSi* was:

- **195/65 R15 91V**

This specification balanced comfort, grip, and refinement—ideal for the car’s executive saloon character. The **“91”** indicates the load rating, and **“V”** denotes a speed rating up to 149 mph, which comfortably exceeds the car’s 134 mph top speed.

 🆕 **Modern Equivalent Tyres (2025)**

Here are some high-quality options in the original size that suit the 623 GSi’s blend of comfort and quietness:

- **Michelin Primacy 4+**  

  - Excellent wet grip and longevity  

  - Quiet and refined—ideal for classic saloons

- **Goodyear EfficientGrip Performance 2**  

  - Strong all-rounder with low rolling resistance  

  - Great for daily use and long-distance cruising

- **Continental PremiumContact 6**  

  - Sportier feel with excellent braking performance  

  - Slightly firmer ride, but very responsive

- **Falken Ziex ZE310 Ecorun**  

  - Mid-range value with good wet handling  

  - Popular among classic car owners for price/performance

- **Nexen N’Blue HD Plus**  

  - Budget-friendly with decent comfort and grip  

  - Suitable for light use or second sets

 🧠 Tyre Tips for Classic Use

- **Avoid low-profile upgrades** unless you're chasing aesthetics—ride quality may suffer.

- **Check date codes** on new-old-stock tyres; anything over 5 years old may be past its best.

- **Rotate regularly** to prevent flat-spotting, especially if the car is stored for long periods.

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Racing

The **Rover 623 GSi** did *not* officially compete in motorsport or racing series during its production life. While Rover had a presence in touring car racing—most notably with the **Rover 216 GTi**, **220 Turbo**, and the **Tom Walkinshaw Racing (TWR)-developed 800 Vitesse**—the 623 GSi was never homologated or campaigned in any major racing category.

 🏁 Why It Didn’t Race

- **Automatic Transmission**: The 623 GSi was primarily offered with a 4-speed automatic, making it unsuitable for competitive motorsport.

- **Luxury Focus**: It was designed as a refined executive saloon, prioritizing comfort over performance.

- **Platform Sharing**: While based on the Honda Accord (which did see some racing in Japan), the Rover variant was never adapted for motorsport use.

 🧠 Motorsport Context

- **Rover’s Racing Efforts** in the 1990s focused on:

  - **BTCC (British Touring Car Championship)** with the 216 GTi and later the 400/200 Series

  - **Rover 800 Vitesse** in Group A touring car events

- The **620ti**, with its turbocharged T-Series engine and manual gearbox, would have been the more likely candidate for motorsport—but even it remained road-bound.

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Valuation

As of 2025, the **Rover 623 GSi (1994–1996)** typically commands values in the UK ranging from **£455 to £1,151**, depending on condition, mileage, and originality. Here's a breakdown:

 💷 **Current Market Values**

- **Lowest recorded sale**: £455  

- **Median sale price**: £860  

- **Highest recorded sale**: £1,151  

- **Sell-through rate**: 67% (indicating steady demand)

 📊 **What Affects Value**

- **Condition**: Original paint, rust-free bodywork, and working electrics boost appeal  

- **Mileage**: Sub-80,000-mile examples are especially desirable  

- **Service history**: Full documentation and Honda-spec maintenance add value  

- **Rarity**: With only ~10 licensed and ~32 SORN in the UK, scarcity is driving renewed interest

 🧠 Collector Insight

While still affordable, the 623 GSi is gaining recognition as a **modern classic sleeper**—particularly among enthusiasts nostalgic for 1990s British-Japanese collaborations.

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Investment Assessment

For 2025, the **Rover 623 GSi (1994–96)** earns a **financial investment rating of 2.5 out of 5**—sitting squarely in the territory of an *emerging modern classic* rather than an outright appreciating asset.

💷 **Reasoning Behind the Rating**

- **✅ Rarity (Score: 4/5)**  

  With only **around 42 known survivors** in the UK, its scarcity is fueling growing interest among collectors.

- **✅ Reliability & Engineering (Score: 3.5/5)**  

  Honda mechanicals mean it’s a dependable long-term keeper, appealing to enthusiasts who want a usable classic.

- **⚖️ Market Values (Score: 2/5)**  

  Current values range from **£455 to £1,151**, with only a modest upward trend—more nostalgic than lucrative at this stage.

- **❌ Brand Prestige & Awareness (Score: 2/5)**  

  While respected in enthusiast circles, it's still largely overlooked in mainstream classic markets compared to contemporaries like the E36 BMW or Audi 80.

- **❌ Limited Motorsport Pedigree & Cachet (Score: 1/5)**  

  Its lack of racing heritage and subdued styling mean it doesn’t yet command a premium among broader collector audiences.

 🧠 Bottom Line

If you're investing for passion, originality, and preservation, the 623 GSi is a hidden gem. But if you're expecting strong capital gains in the short term, it remains a **modest, long-play prospect**—at least until broader reappraisal catches up.

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Clubs

There are Rover owners clubs in Northern Ireland. One notable club is the Classic Rover Club Northern Ireland. This club is dedicated to all owners and enthusiasts of the Rover marque. They meet on the second Monday of each month at the Ivanhoe Hotel in Carryduff and participate in various classic and vintage events throughout Ireland.

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