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Kalums · 01-16-2025, 03:20 PM

Suggestions for a good "break-in" oil? I'm going to do the GM procedure which says 10w30 but most people I have talked to say 20w50 and a high zinc oil and/or additive. Opinions welcome.

01-16-2025, 03:20 PM	#17
Kalums Registered User Join Date: Jun 2024 Location: Phoenix,AZ Posts: 228	Re: 71 GMC engine swap-arino Suggestions for a good "break-in" oil? I'm going to do the GM procedure which says 10w30 but most people I have talked to say 20w50 and a high zinc oil and/or additive. Opinions welcome.