I'm about 3K miles from my next oil change.
I already run Mobile one Synthetic. Is it a good idea to switch to Royal Purple and to take advantage of the rest of their product line?
Engine, T-case, AT, and Diffs?
What do you think? Some of the most well known engine buiders have switched over to it. (Even my Dad for his stock cars, supermodified engines).
Pop said it couldn't hurt, but thought GM might have something to say about it.
