Re: Synthetic Oil?
afaik, only Mobil 1, Chevron Supreme Synthetic and Texaco Havoline Synthetic meet the GM4718M spec for synthetic oil. Not that every other synthetic is worthless ... they just may not be certified yet.
I'm a big fan of Mobil1 and have used it in all my vehicles. Makes cold startups a LOT easier.
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2007 slate blue 5spd w/ adventure package. Still pretty much stock ... dammit
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