I have 3 cases (18qts) of Pennzoil Performax
5w30 full synthetic that is rated for SH service. Since this is a PAO (I believe) would it be OK to use in my current car which calls for SJ oil. What are the negatives of using it?
Johnny , Thanks for verifying that Performax is a PAO. How does it compare with Mobil 1 ? Also do you know anything about Slick 50 synthetic (also SH rated) I have a few quarts of it also.
Regarding the cat converter fouling sooner with
SH oil what mileage are we talking about? Am I to believe that SH oil is as good as SJ (maybe better) and that the only issue is cat fouling due to greater amounts of phosphorous in SH oils?