NAPA 5w30 synthetic

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this was the last UOA I did on Napa 5w30 Synthetic, it was the most recent SP version, this was after 5000 miles, in a 6.0 Vortec 3500HD, in heavy use. I would say the oil is pretty durable at least.
 
Yeah I used it on and off for a few years in multiple different vehicles, never any sort of issue with it.
 
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