I will be posting a UOA on Napa Synthetic 5W30 in several weeks. I'm going for 8,000 mile run. We can compare between the virgin and the used oil to see how close they are. I love Napa Synthetic Oil! Now we can stop all the jargon about it being Valvoline Synthetic Light. I say within margin of error it's almost exactly the same as regular synpower, I'm glad I have 1.5 cases left.
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