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Steve, just as an aside, I know no longer pertinent to your original question, but: a good turn out at an X150 seminar organised by the JEC last weekend. One of the key points related to oil services for the 5L V8. David Marks was the technical/ mechanical guru delivering the presentation His advice was that the single most important maintenance step for the engine was that annual or 6k miles oil replacement/service was not just recommended, but in his experience ,essential for the long and trouble free life of the engine. Further to the regime, critical too that the oil used is CASTROL EDGE PRO, 0-20W, which is specifically recommended for JLRV8 engines. This oil even if your filler cap states 5-20, as Jaguar later a made advisory that 0-20 is the recommended grade.