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GM now factory fills the LT1 with Mobil 1. My C7 came with a promotional brochure from GM suggesting Mobil 1.

Z51 will take 9.8 quarts / non Z51 7 Quarts. 5W30 as printed on the oil fill lid.

If you're not a fan of Mobil 1 you can safely use any dexos approved oil, see list here: dexos1 Brands | GM
 
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