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Re: 79 C10 Oil Viscosity for older 350 EnginePosted by Billy on December 31, 2006 at 16:54:01 from (205.188.116.200): In Reply to: 79 C10 Oil Viscosity for older 350 Engine posted by 1951RTU on December 31, 2006 at 16:18:09:
Depends on where you live...if it's warm I'd use 10w40 if cold I'd use 10w30
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