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Originally Posted by Jagdpanzer
SAE 5W-30 is the oil weight GM specifies for the ZR-1 LT5 engine.
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FYI, only the later year cars. The '90 specified 10w-30. I think the change came when the LT1 came out, probably so they only had to keep one oil on hand. I could be mistaken about the transition year though.