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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

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Cab,

I have 2 Mercedes that everyone & the dealer swore had to have synthetic in them. I back tracked down the EU and API specs for lube oil on each model, selected an appropriate conventional oil and put it in. That was collectively 150k miles ago.

I tried the synthetic in the race car once, didnt see any appreciable wear improvement, but had indications of low viscosity at temperature.

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Some cars experience tremendous oil consumption on long highway runs. My 30,000 mile GT Mustang used 4 quarts of 5w30 mobil 1 oil when I drove it across country a few years back.

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