What is the sound of one piston slapping?
What is the sound of one piston slapping?
Illustration for article titled Why Does My Oil Look Like This?

See that swirl? What’s up with that? There was a little bit of oil in one cylinder when I changed the spark plugs recently. Compression is good, though (140 PSI in every cylinder). Is it just some moisture because this sat for a while during the rainy PNW winter?

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