The Best Years For Jaguar Xj And Some To Avoid

The Jaguar XJ, a quintessential British luxury saloon, has a rich history spanning decades. Finding the perfect XJ involves navigating a complex landscape of different generations, engine options, and potential pitfalls. This guide aims to provide a comprehensive overview of the best and worst years for the Jaguar XJ, empowering you to make an informed decision whether you're seeking a classic collectible or a modern daily driver.

Detailed Explanations

Series I (1968-1973): The original XJ, a revolutionary design for its time.

• Late Production (1972-1973) 4.2L: These models benefited from refinements made throughout the production run, making them slightly more reliable than earlier examples. The 4.2L engine is generally considered robust.
• Early Production (1968-1970): These suffered from teething problems, particularly with the complex Lucas electrical system and cooling system deficiencies. Unless meticulously restored, these can be problematic.

Series II (1973-1979): Introduced styling changes and various mechanical updates.

• 1977-1979 4.2L (Improved Fuel Injection): These later Series II cars featured improved fuel injection systems, enhancing performance and reliability compared to the earlier carbureted or early fuel-injected models.
• Early Series II (1973-1975): Prone to rust, especially in areas with road salt. The early fuel injection systems were less refined.

Series III (1979-1992): A significant facelift and modernization of the XJ platform.

• 1987-1992 (XJ40 Pre-facelift) 4.0L inline-six: The 4.0L inline-six engine is known for its smoothness and reliability. These later Series III cars offered a good balance of classic XJ styling with improved mechanicals. Note this is before the XJ40 model designation, even though the engine is the same.
• Early Series III (1979-1986): Carbureted models are less reliable and efficient than the later fuel-injected versions. Rust is a common issue, especially in areas with harsh winters.

XJ40 (1986-1994): A completely new design, marking a significant departure from previous XJ models.

• 1993-1994 (Improved AJ6 engine, better build quality): These final years of the XJ40 saw significant improvements in build quality and reliability. The updated AJ6 engine was more refined and less prone to head gasket issues.
• Early XJ40 (1986-1989): Suffered from complex electronics that could be problematic. Head gasket failures were a common concern, and the overall refinement wasn't as high as later models.

X300 (1994-1997): A return to classic XJ styling, based on a refined XJ40 platform.

• 1996-1997 (Final years of production, refinements made): These benefited from incremental improvements made throughout the production run. Considered the most desirable of the X300 series.
• None particularly to avoid completely: The X300 is generally a reliable car. Later years are simply better due to the cumulative effect of minor improvements. Inspect for rust, as with any car of this age.

X308 (1997-2003): Introduced the V8 engine to the XJ range.

• 2000-2003 (Revised timing chain tensioners, later build quality): These later models incorporated updated timing chain tensioners, addressing a significant weakness in earlier versions. Overall build quality also improved.
• Early X308 (1997-1999): The Nikasil-lined cylinder bores were prone to wear in markets with high-sulfur fuel. While many affected cars have been re-sleeved, it's crucial to check the engine's condition. Timing chain tensioner failures were also a concern.

X350/X358 (2003-2009): An all-aluminum body and advanced technology define this generation.

• 2007-2009 (X358 Facelift, most reliable years): The X358 facelift brought subtle styling updates and further improvements in reliability. These are considered the most dependable of the X350/X358 series.
• Early X350 (2003-2004): Some initial electronic glitches were reported, but overall, the X350 is a very reliable car.

X351 (2009-2019): A bold, modern design that marked a significant departure from previous XJ models.

• 2016-2019 (Most refined, updated infotainment): These final years of the X351 offered the most refined driving experience and featured updated infotainment systems.
• 2010-2012: Early models may have some initial production quirks and the infotainment system wasn't as advanced as later versions.

Frequently Asked Questions

• Which XJ is the most reliable? The X358 (2007-2009) is generally considered the most reliable XJ, followed closely by the later X300 models (1996-1997).
• Are older XJs prone to rust? Yes, XJs from the Series I to the XJ40 era are susceptible to rust, especially in areas with road salt. Careful inspection is essential.
• What is Nikasil lining and why is it a problem? Nikasil was a cylinder lining used in early X308 V8 engines. In markets with high-sulfur fuel, it could corrode, leading to engine wear and failure.
• What should I look for when buying an XJ? Check for rust, engine condition (especially timing chain tensioners on X308s), electrical functionality, and service history. A pre-purchase inspection by a qualified mechanic is highly recommended.
• Are parts readily available for older XJs? Parts availability varies depending on the model year. Some parts for older models can be challenging to find but are often available through specialist suppliers.

Conclusion

Choosing the best Jaguar XJ depends on your priorities. For classic charm and simplicity, a late Series III or X300 is a good choice. For modern luxury and reliability, the X358 or a later X351 offers the best combination of features and dependability. Regardless of your choice, thorough research and a pre-purchase inspection are crucial to ensure you find an XJ that will provide years of enjoyment.