Quote:
Originally Posted by wally mayfield
what synthetics are acceptable to GM? don't the vettes come with mobil1??
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Your car came factory fill with Mobil 1. Mobil 1 is fine if youre stock. They really have taken a nose dive since the EPA has gotten a lot stricter with their regulations. If you have modified internals, (cam, springs etc...) there is much better options out there. VR1, Joe Gibbs, Amsoil being your best options.