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Re: Too old for sythentecic oil?
It was explained to me that synthetics have a lower zinc content which make then a bad choice for older non roller motors. If you decide to run synthetic it's best to add a zinc additive.
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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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