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Follow up—after some google/YouTube research, I tried starting the car with the oil cap off. Got steady puffs of air and a little spray of oil, so now I’m thinking worn or stuck rings. Ahs anyone tried freeing them with crankcase additives?

My 2010 Corolla’s engine has started getting noisy when accelerating after hitting 2000 rpms. It’s a zzzzzzzzing noise that remains there until the transmission shifts at about 300p rpms. After the upshift, there’s a mild clattering, almost diesel-like. The clattering isn’t loud, but the zing is...