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Re: Too old for sythentecic oil?
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Originally Posted by treveiger
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A synthetic with added zinc. You can't go wrong.
I'm running a crate motor in my truck. The manufacturer clearly states DO NOT run synthetic oil unless you add a zinc additive. I would say the zinc argument does hold water.
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'68 C-10 SWB 383 Stroker (Sold 3/2/2013)
'87 R2500 LWB 454 TBI converted to Carb 
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