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Thread: Rough Idle on my Chevy 350

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05-18-2014 08:43 AM #8

Zombiebrew
CHR Member

Join Date

May 2014

Location

Seattle

Posts

46

Originally Posted by pepi

FWIW 20-50 in not a good choice, stock 350 stick with the spec weight viscosity. If it has some whoop-ass and you lean on it often, Castrol 20w-40 will work great.

Might also add some Marvel Mystery oil the gas tank, good for valves and guides.

Another board suggests adding a quart of significantly thinner oil to balance out. Any suggestions?

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