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I beleive a lot of the high dollar imports, Lexus, BMW, Jaguars, Mercedes Benz as well as some others come from the factory with pure sybthetic oils in the engines. I think that maybe some American cars do also, maybe not I know a lot of NHRA class racers swore that there cars pick up ET and MPH when they switch to
multi viscoty synthetic oils

The new vettes and mine 2000 Transam firehawk and i even think ford did with thier 03-04 corbas. My 97 honda cbr900 picked up a tenth going to mobil 1 15-50 . also i forgot my wifes 06 gto come from the factory using mobil 1 syn