XJ8 / XJR - X308 (1998 - 2002) parts

The Jaguar XJ X308 (1997–2003)

The Jaguar XJ X308 was produced and sold between 1997 and 2003. Its exterior styling closely followed that of its predecessor, the XJ X300, with minor but meaningful refinements. From the outside, the two models are almost identical — the easiest way to tell them apart is the shape of the indicator lenses: the X300 has rectangular lenses, while the X308 has oval ones.

Engine & Transmission

Under the bonnet, the X308 represented a significant departure from earlier XJ models. A new eight-cylinder AJ-V8 engine — available in 3.2-litre and 4.0-litre variants — replaced the inline-six and V12 engines that had powered the previous generation. This shift gave rise to the "XJ8" badge, replacing the familiar "XJ6" and "XJ12" designations to reflect the new V8-only powertrain.

All X308 models were paired with a five-speed automatic transmission. The naturally aspirated 3.2L and 4.0L models used a ZF 5HP24 gearbox, while the supercharged 4.0L XJR received a Mercedes-Benz 5G-Tronic W5A580 unit.

Suspension

The X308 retained the Jaguar Independent Rear Suspension that had been a hallmark of the XJ line for decades. The range-topping XJR came with Jaguar's "Computer Active Technology Suspension" (CATS) system as standard — an electronically controlled setup that continuously adjusts damper settings to match road conditions, improving ride quality and handling while virtually eliminating body roll.

Model Range & Trim Levels

Jaguar offered the X308 in several distinct trim levels, each targeting a different buyer:

• XJ8 (also badged "XJ Executive" in some markets) — the entry point to the range, offering the full XJ experience with the naturally aspirated V8.
• XJ Sport — sportier seating, wider alloy wheels and a firmer suspension setup for drivers who wanted a more engaging ride.
• Sovereign — the traditional luxury-focused model, loaded with the wood veneer, leather and refinement that Jaguar was known for.
• XJR — the performance flagship, powered by the supercharged 4.0-litre V8 and capable of 0–60 mph in just 5 seconds.
• SE — a competitively priced specification designed to broaden the XJ's appeal.
• Daimler / Vanden Plas — the pinnacle of the range, combining a supercharged engine with the most comprehensive luxury appointments available.

Production History

The X308 had a six-year production run that saw several important mechanical and administrative changes. Production began in July 1997 with the introduction of the AJ-V8 4.0-litre engine, and the first 1998 model-year cars rolled off the line almost immediately.

Annual model-year updates followed each summer: the 1999 model year in August 1998, the 2000 model year in August 1999, and the 2001 model year in July 2000. The 2001 update was particularly significant as it marked the switch from the original Nikasil cylinder bore coating — which had proven problematic in markets with high-sulphur fuel — to more durable steel liners, resolving a well-known reliability concern for buyers of earlier cars.

In February 1999, Jaguar introduced a new VIN numbering system, resetting the sequence from the previous format (short VIN 853936) to a new series beginning at F00001. This change can catch out owners and specialists searching for parts by VIN range.

The 2002 model year arrived in July 2001, and the final 2003 model-year cars — produced to North American specification only — entered production in January 2002. The last X308 built carried short VIN F59525 and left the Browns Lane factory in August 2002, closing the chapter on one of the most refined saloons Jaguar had produced.