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I would use the weight that is on your oil cap, also I don't know how easy it would be for you to get it or if you care ,but I use Brad Penn oil. It was highly recommended to me from an engine builder I know and even people I race with because I have a high performance engine. My $.02
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1973 Chevy Nova - best e.t.-10.04 - currently disassembled
1989 Pontiac Trans Am GTA
2016 Dodge Durango R/T
2015 Ram 3500 Dually Cummins
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