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The owner's manual and FSM for the 2001 both call for 5W30. It's a good winter weight because it provides better start-up circulation, before the oil gets warm enough to thin out. If you want to run dinosaur juice, that's what you should run.
Thanks for the input everyone. I've always been a Castrol GTX guy, but I'm going to check out Mobil-1 for the XJ. That appears to be the overall favorite for dino juice (did a ton of searching here).
Thanks for the input everyone. I've always been a Castrol GTX guy, but I'm going to check out Mobil-1 for the XJ. That appears to be the overall favorite for dino juice (did a ton of searching here).
Mobil-1 is full synthetic. You asked about dino oil, which means conventional petroleum based. If you want synthetic, Castrol offers Syntec in a 5W50 weight. That's what I run and I'm very happy with it. Up north where you are you could run 5W30 for winter and 5W50 in the summer.
If you want conventional dino oil, stay with Castrol GTX and use 5W30 all year. That's what the factory calls for in your vehicle.