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Jaguar Mk10/420G (1961-70)

Total Production: 3.8= 13,382/4.2= 5,137/ 420G= 5,763
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Price New: The new price for a Jaguar Mk X in the UK in 1961 was approximately £2,256.
The new price of a Jaguar MkX in 1961 was approximately **£2,000**. Adjusted for inflation to 2025, this would roughly equate to **£45,000**.
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Rivals: In 1961, the prices of some of the main sedan rivals to the Jaguar Mark 10 in the UK were as follows:

- **Rolls-Royce Silver Cloud II**: Approximately £6,588
- **Bentley S2**: Approximately £6,288
- **Mercedes-Benz 300 SE**: Approximately £4,500
- **Rover P5**: Approximately £1,648

These prices reflect the competitive landscape of luxury sedans during that era.
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Recorded in UK 2025
420G Licensed=135 SORN=79
Mark 10 Automatic Licensed=51 SORN=19
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PLEASE NOTE: The information provided below is given in averages across Northern Ireland at the date specified. Petrol reflect average prices for four star fuel in litres.

Road Tax: In 1961, the road tax for a Jaguar Mk X in the UK was approximately £15 per year.
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Petrol: In 1961, the cost of four-star petrol in the UK was approximately 12.9 pence per litre.
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Insurance: I couldn't find the exact average cost of insurance for a Jaguar MkX sedan in 1971 in the UK. However, insurance costs for classic cars like the Jaguar MkX can vary widely based on factors such as the driver's age, location, and driving history.
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Jaguar Mk10/420G (1961-70)

COMMON FAULTS
Please Note: Common Faults in Regularly Used Vehicles vs. Low-Mileage Stored Vehicles that have been used consistently over many years, accumulating approximately 10,000–12,000 miles annually, are more prone to common faults due to regular wear and tear. These issues typically arise from the natural aging of components subjected to frequent use, such as engine parts, suspension systems, brakes, and tires. In contrast, vehicles with low mileage that have been stored or preserved are likely to experience different types of issues. These vehicles are often better maintained to ensure their longevity and may avoid some of the typical wear-and-tear problems seen in regularly driven cars. However, they can still face unique challenges such as degradation of rubber seals, corrosion from prolonged inactivity, or fuel system issues caused by old or stagnant fuel.

The **Jaguar Mark X** (later renamed the **Jaguar 420G**) had a few common issues:

1. **Quality Problems**: The Mark X suffered from quality problems, which led Jaguar to re-badge it as the 420G to erase the stigma.

2. **Rust**: As with many older cars, rust on the chassis and suspension mounting points can be a concern.

3. **Strange Brakes**: Early Mark X models had strange bellows/servo-assisted brakes.

4. **Chrome Strips**: The later 420G models (all 4.2-litre) had chrome strips along the side and generally addressed earlier problems.

Remember, the 420 is a scaled-down 420G, similar in size to the S-Type, with a 4.2-litre carbureted engine.
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Generations/Trim Levels
The **Jaguar Mark X**, later renamed the **Jaguar 420G**, had **one generation** during its production from **1961 to 1970**. It served as Jaguar's top-of-the-range saloon car, combining luxury with modern features like four-wheel disc brakes and independent rear suspension.
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Body Style/Variants
The **Jaguar Mark X**, later renamed the **Jaguar 420G**, was available primarily as a **4-door saloon**. Its design featured an **upright front fascia**, **quad round headlights**, and a **shallow forward-leaning grille**. While it didn't have multiple body styles or variants, the Mark X was a hallmark car for Jaguar, introducing modern features like **unitary bodywork**, **four-wheel disc brakes**, and **independent rear suspension**.
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Trim Levels
The Jaguar Mark 10, also known as the Mark X, was produced from 1961 to 1970. It didn't have distinct trim levels like modern cars, but it did have variations based on the engine and some features. Here are the main versions:

1. **3.8 Litre**: This was the initial version, equipped with a 3.8-litre XK inline-six engine.
2. **4.2 Litre**: Introduced in 1964, this version had a larger 4.2-litre XK inline-six engine.
3. **420G**: In 1966, the Mark X was renamed the 420G, which continued with the 4.2-litre engine but included some updates and refinements.

Each version maintained the luxurious and spacious design that the Mark 10 was known for, featuring advanced technology for its time, such as four-wheel disc brakes and independent rear suspension.
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Engines
The **Jaguar Mark X** (later renamed the **Jaguar 420G**) featured different engine options during its production:

1. Initially, it was available with the **3.8-litre engine**, which was also used in the iconic E-Type sports car⁴.
2. Later, in **1964**, the model was upgraded to the **4.2-litre engine** along with an all-synchromesh manual gearbox, improved brakes, and power steering.

These engines provided a blend of power, performance, and luxury for the Mark X.
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Performance
The 1970 Jaguar MkX offered impressive performance for a luxury sedan of its time. Here are the key performance figures:

- **Engine**: 4.2-litre XK inline-6
- **Power output**: 265 bhp (198 kW)
- **Torque**: 283 lb-ft (384 Nm)
- **0-60 mph**: Approximately 9.9 seconds
- **Top speed**: Around 121 mph (195 km/h)

These performance figures made the Jaguar MkX a formidable competitor in the luxury sedan market of its era.
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Rivals
In 1970, the main sedan rivals to the Jaguar MkX offered the following performance:

- **Rolls-Royce Silver Shadow**: Equipped with a 6.2-litre V8 engine, it produced around 189 horsepower. It had a top speed of about 118 mph and could accelerate from 0-60 mph in approximately 10.9 seconds.
- **Mercedes-Benz 300 SEL 6.3**: This sedan featured a 6.3-litre V8 engine producing around 247 horsepower. It had a top speed of about 137 mph and could accelerate from 0-60 mph in just 6.5 seconds.
- **Bentley T1**: Powered by a 6.2-litre V8 engine, it produced around 189 horsepower. It had a top speed of about 118 mph and could accelerate from 0-60 mph in approximately 10.9 seconds.
- **Rover P5B**: This sedan had a 3.5-litre V8 engine producing around 160 horsepower. It had a top speed of about 115 mph and could accelerate from 0-60 mph in approximately 11.7 seconds.

These performance figures reflect the competitive landscape of luxury sedans during that era.
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Designer/Dimensions
The Jaguar MkX was designed by Sir William Lyons, the founder of Jaguar Cars. He played a significant role in shaping the design and aesthetics of the car.

As for its dimensions, the Jaguar MkX had the following measurements:
- **Wheelbase**: 120 inches (305 cm)
- **Length**: 202 inches (513 cm)
- **Width**: 76.3 inches (194 cm)
- **Height**: 54.5 inches (138 cm)
- **Kerb weight**: 4,200 lbs (1,900 kg).
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Spares/Specialists NI
If you're looking for **Jaguar MK10** spare parts in the United Kingdom or Ireland, here are some options:

1. **SCParts.co.uk**: They offer a selection of **spare parts for Jaguar MK10 and 420G (1961-1970)**. You'll find components like cylinder head gaskets, brake pads, clutch kits, water pumps, and more.

2. **Moss Europe**: Another reliable source is **Moss Europe**, where you can buy **Jaguar Mark 1-10 parts & spares** online with fast shipping and easy returns.

Remember to verify compatibility and availability based on your specific MK10 model.
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Specialists NI
Here are some Jaguar specialist mechanics in County Antrim, Northern Ireland:

1. **Stephen Groves Jaguar Specialist**:
- **Location**: Belfast, Hillsborough, and Lisburn
- **Services**: Jaguar servicing, MOT preparation, diagnostics, and repair work
- **Contact**: [Stephen Groves Jaguar Specialist](https://www.stephen-groves.co.uk/).

2. **Blakely Vehicle Services**:
- **Location**: Belfast
- **Services**: Electrical and mechanical repairs, diagnostics, and servicing
- **Contact**: [Blakely Vehicle Services](https://blakelyvehicleservices.co.uk/independent-jaguar-specialist).

3. **McMillan Specialist Cars**:
- **Location**: Antrim
- **Services**: Jaguar servicing, mechanical repairs, and advanced diagnostics
- **Contact**: [McMillan Specialist Cars](https://mcmillanspecialistcars.com/car-service-prices/jaguar/).

Jaguar specialist mechanics in County Down, Northern Ireland:

1. **Andrew Lindsay Specialist Cars**:
- **Location**: 2 Vestry Road, Ballygowan, Newtownards, BT23 6HJ
- **Services**: Jaguar and Aston Martin servicing, mechanical repairs, and advanced diagnostics
- **Contact**: 028 9754 2979
- **Website**: [Andrew Lindsay Specialist Cars](http://andrewlindsayspecialistcars.com/)

Jaguar specialist mechanics in County Londonderry, Northern Ireland:

1. **MIM-NI Ltd.**:
- **Location**: 6 Carrakeel Industrial Park, Maydown, BT47 6UQ
- **Services**: Mechanical installations and maintenance
- **Contact**: 028 7186 1244
- **Website**: [MIM-NI Ltd.](https://www.mim-ni.com/)
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Racing
The Jaguar Mark 10, also known as the Mark X, was primarily designed as a luxury saloon car and not specifically for racing. It was renowned for its spaciousness, comfort, and advanced technology for its time, such as independent rear suspension and four-wheel disc brakes.

While the Mark 10 shared some components with Jaguar's racing cars, like the 3.8-litre engine used in the E-Type, it was not commonly used in competitive racing due to its size and weight¹². The car was more suited for VIP and executive travel rather than the racetrack.

However, Jaguar's racing heritage and engineering prowess did influence the design and performance of the Mark 10, making it a high-performance luxury vehicle for its era.
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Valuation
The value of a Jaguar MkX today in the UK can vary depending on its condition, mileage, and history. Based on recent listings, the average sale price for a Jaguar MkX is around £16,106. However, well-maintained or restored models can fetch higher prices.
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Clubs
There are clubs in Northern Ireland for Jaguar MkX owners to join. One notable club is the [Jaguar Enthusiasts' Club](https://jec.org.uk/regions/ni), which has a Northern Ireland region. They organize monthly outings, social events, and provide a platform for Jaguar owners to connect and share their passion.

Another option is the [Jaguar Drivers' Club Area 30](https://www.jaguardriver.co.uk/areas/northern-ireland), which is dedicated to Jaguar owners in Northern Ireland. They offer membership, events, and a community for Jaguar enthusiasts.

These clubs provide a great opportunity to meet fellow Jaguar MkX owners and participate in various activities and events.
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