The OP asked what kind of oil do you put it the Z. The answer for most of us was found in the OM. The only choice now is synthetic or dino and which brand. There isn't a lot of difference in brands - they all lubricate well. I don't second guess the engineers that designed this engine if left in stock form or added a few mods. If FI is used, then go with the FI manufacturer's recommendation.
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"America.... still builds rockets!"
Vette: 355 cid, 400 rwhp
'13 CTS-V Coupe: 6.2L LSA, 556HP
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