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Re: 1971 C20 longhorn 350 oil weight
It depends on the number of miles on the engine. I normally run 10-30 wt in my vehicles, but some people run heavier weights in high mileage trucks.
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'67 Chevy C-20 short stepper - build complete, 454/SM-465.
'75 C-30 Single Cab DRW-350 small block/NP-435.
'77 GMC-6500 Dump Truck, 427 Tall Deck.
'92 GMC K-3500 Duallie, 454/4L80E.
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