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DevilDisco, I have an '02 Disco pushing 97,000 miles. Mine has never ticked at start-up or any other time. I've used a variety of oil since I bought it with 58,000 miles on it. I've done several used oil analysis. They seem to show that using a K&N air filter is a quick way to engine death. I used it for two seperate OCIs, just to be sure the poor used oil analysis results were repeatable, unfortunately they were and silicon and lower engine wear metals shot-up when running the K&N air filter. The best used oil analysis I've ever gotten on mine was with Lubro Moly 0w40. My Rover returned a respectable used oil analysis with that oil. The used oil analysis I did with GC wasn't exactly stellar, but not in the toilet either. I have Pentosynthetic 5w40 in mine right now and we'll see how the used oil analysis looks in another 1,000 miles or so. You can tell I'm partial to the more robust formulations found in oils of German manufactor. Others on this board have has nice used oil analysis with the Rotella T Synthetic 5w40 you're looking to run and you probably would be fine using it. I believe your dealer doesn't know what they're doing. They are stocking 5w30 for the newer Jaguar V8s in the LR3 and RR, and neglecting the older Discos. This engine was designed in the early 60s when engine and lubrication management were as yet unrefined. LR put better fuel induction on it, but I'd bet that they didn't alter the basic lubrication design from the 60s, which would have called for a heavier oil. Most of the Rover guys I know who change their own oil use 20w50 conventional. Whichever route you go, I'd advise to stay thick and thicker. I'm toying with moving to a xxw50 synthetic when I use up all my German stash.
Just my 2 cents. Good luck. Chris