It's not Syntec, it's any modern synthetic oil that would have done the same thing. They have a lot of cleaning power since they're better-made than dino oils. Although modern dino is fantastic stuff too.
I'm convinced that oil is at the point where it's shades of excellence. There's truly no such thing as a poor-quality SM-spec oil these days. Even the cheap stuff will still go 5k miles, and the expensive stuff will go 10, 15, 25k without breaking down.
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2012 Chevrolet Cruze Eco 6MT
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