Note that Jaguar specified a couple of specialist Shell greases for the wheel hubs and for the wiper rack. Finding an equivalent is virtually impossible, since there seem to be no specs available to compare with. I think the wiper rack one has special water properties, but I'm not sure what. The hub greases were rated to higher temperatures. For normal use, I doubt it matters, but on a couple of occasions I found out why. (a) track days, and (b) descending the hill into Applecross (that's very long and very steep). In both cases, when stopping after prolonged heavy braking with no "cool down" period, the front of the car disappeared in a cloud of white smoke. It was the red-hot brake disks boiling the hub grease!
1991 XJS V12 "facelift"
2008 XJ TDVi
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