Depends on where you live, cold places need thinner oil. I live in a moderate climate, little to no snow and have had the best success with 20W50.
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Southpa
1970 GMC 1500 Custom
Victoria, BC, Canada
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1970 GMC 1500 Custom
Original 350/TH350
Victoria, BC, Canada
You can wish in one hand and crap in the other.
See which one gets filled first.
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