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I just checked the Owners manual supplement for the 2018 ZL1 and the oils you listed are for competition/track events so I would assume if you are mainly driving on the street then the oil grade is 5w30. Did you get a supplement to your owners manual? I looked it up on the web and found the info.
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ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.
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