Quote:
Originally Posted by tomtom72
Mobil synthetic 75w-90 fluid and it don't need the additive. I can't remember the capacity, maybe a bit more than a quart or a bit less? It's in the owner's manual maintenance section I think?

Tom
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Tom,
Marc recommended 1/2 a bottle of GM posi additive w/ Mobil 1 75W-100.
2 X 1 liter bottles were sufficient.