Originally Posted By: demarpaint
I just posted this in another thread Amsoil vs. Mobil 1.
My brother emailed them and this was their reply: For whatever its worth. Remember "if it turns out to be true.
He said that he read on the www that Valvoline was making claims that M 1 5W-30 didn't meet API SM and ILSAC GF-4 specs. He then asked if he had a warranty issue using 5W-30 in a new car spec for API SM ILSAC GF-4 if there would be an issue. Their reply fwiw.
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Mobil1 5W30 does meet and exceed API "SM: and ILSAC GF-4 requirements,
don't know who or where you are getting your information from. I would
seriously doubt that GM would choose Mobil1 5W30 over all other oils
they tested for factory fill in their Corvettes, Cadillac and all their
other supercharged vehicles.
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Well, since your brother has started communications with Mobil, maybe he should reply back and ask them to look at this website:
http://www.jobbersworld.com/December 11, 2008.htm