Quote:
Originally Posted by jehartley
It isn't just Amsoil's OE and XL line that claims dexos certification, but now their Signature Series oils (ASL, ASM, ATM, and AZO) say they are certified as well, however, none of them are certified and do not appear on GM's list, Amsoil is just stating that their oils meet the spec...big difference.
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The owners manual doesn't say a thing about being certified. It says to look for and only use oil that meets the requirements. Amsoil meets those requirements.