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I have a couple higher mileage Hemi's, older ones without VVT, and have tried various oils, trying to find out which ones are quieter. My 2005 pickup with approx 130k on it, literally sounds like a diesel when it's cold, LOTS of piston rattle which goes away when it warms up. No exhaust leaks...

I have a few Hemi's, one literally rattles like a diesel when it's cold and it doesn't go away completely when warm, one ticks when it's cold and comes off fast idle but the tick goes away if you goose the throttle a couple times, if you let it idle it will come back, completely goes away when...