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anything that matches what's asked for on the oil cap...for a DD, change on a regular, sane basis (like every 5000) don't over think this....

OH yeah, IMO
 

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Any good name-brand synthetic 5W-30, Dexos 1 rated.

Personally, I like the Penzoil Platinum line.
 

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cars leaving factory now what motor oil going in first change coming what oil to use ?
GM got tired of the phony claims by those selling snake oil so to assure their engine designs are protected,
designed a new engine oil makeup and test process.

As since the C6s GM requires a oil that has been GM tested, is licensed and is on the GM approval list
This standard for gas engines is dexos1
No need to guess by going to GM's dexos website and seeing what brands are offered at :

dexos1 Brands | GM
 
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