SH rated Synthetic oil

pbm

Messages
8,878
Location
New York
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?
 
Messages
917
Location
Singapore
The additive package would be stronger for SH oils. So if your vehicle has a CAT installed, it would poison it quicker than if you were using a SJ or SL oil.
 

pbm

Thread starter
Messages
8,878
Location
New York
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?
 

MolaKule

Staff member
Messages
21,857
Location
Iowegia - USA
PBM, You are correct. However, Pennzoil Performax was one of the best synthetic oils on the market. Like Johnny said, if you want to get rid of it, you have now have two potential "off-loaders."
 
Top