Quote:
Originally Posted by triggerjerk
My ZL1 has low miles and so it is still on some complimentary dealer oil changes that I assume are Delco 0w-40. Which is not an API SP or ILSAC GF-6 spec. But it might offer similar protection.
I will be switching over to Supercar 5w-50 (which is approved in the owner's manual) at the next oil change because it is an API SP oil (0w-40 isn't) and has more zddp (but not enough to damage the catalytic converters).
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When I got my free oil change last year I googled the oil part number from the invoice and it was mobile one 0w-40 super car. Yours might also have that oil.
To the op I actually think I read on these boards that mobile one actually makes the ac delco oil.