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I wish that was the case. I have MMO in it and it has not stopped the piston slap.

My 2009 Tacoma with a 2.7 started with a piston slap about four years ago. Each year it got worse. Only did it in the winter below 30°. And not at start up, it would idle quiet, but is soon as I put it in gear (stick) and let the clutch out, major rattle. This year it got so bad I was afraid I...