I like Mobil One and use it in my other cars, but not in the Cobra. I cannot find 20/50 any more and the thinner 10/30 combined with the
synthetic properties makes it "blow by" the piston rings and leak out the seals on my "antique" engine. I am having much better performance with the Shell Rotella 10/40. It runs just as good and doesn't leak everywhere. The
oil pressure is much better, too.
I believe that it continues to have
zinc in it which helps with that camshaft wear issue.
RS