I have been quiet for awhile here a Jaguar Forums so first i hope everone had a GREAT new year. I just wanted to ask you guys if anyone here has tried Royal Purple oil in there Jaguar? Would it be a better choice over the Mobile 1 i am useing now? If anybody has any feedback or comments on RP that would be great. Thank you!

 

Tough to say. I go with synthetics in mine, and change about every 10K miles. I recall Consumer Reports did an article some years ago comparing motor oils in NYC taxi cabs. You may want to look that one up. Finally, let us know what you decide.

 

Royal Purple should be workable in the modern Jaguars. I have never had a problem, as I use it in everything. The older pre-catalyst cars would do better with the High Performance RP which contains zinc and phosphates for metal protection in the softer metal Jags. I had a cylinder head redone in a 70's XJ6 which bronze guides were introduced and was told by the machine shop not to use synthetic oil on bronze guide cars. My 03 Cooper S which has plenty of track time has been RP'd since new with no complications or leaks.

 

Sorry for the late reply guys,

On the other hand thank you for your feedback! I ordered a 12 qt case online of Royal Purple 20w50 online a xj40 4.0 takes 8.5 qt's right?

 

According to my XJ40 Driver's Handbook (been on the bookshelf for a lot of years!) and Haynes Manual, it's 8.0 Litres including oil filter which equates to 8.45 US Quarts.

Graham

 

I stand corrected, thank you for the information Graham.