I have a 1990 Jag XJ6 that is currently stored, but soon I'll be facing a bit of an oil dilemma. I want to use the same brand of oil but am okay switching between weights as seasons change. In my civic I use cheap 0W30 during the winter and would like to use the same in the Jag during the winter, minus the cheap part.

I live in fairly extreme temperature zone ... -40C/F in the winter and 35C/95F in the summer.

What do you guys (and girls) recommend that I use for brand and viscousity? I'm new to the car still so any help would be appreciated! Thanks!

 

If using a regular oil, I'd go with with Mobil Delvac 15W-40. It's a diesel oil but don't worry they work fine in gasloine engines too.

I am notsure if you want to convert to sythetic but if so go with Mobil 1 5w-40 or 0W-40. Try to stick to a 40 weight oil in general.