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Thanks. No, not sure it’s not. However the sound is a staccato sound, that directly follows engine rpm, as opposed to what I would expect to be a constant buzzing sound of a rolling timing chain. And, the lambo reference was to the reduced oil pressure observed. My engineering brain thinks that...

I stand corrected. Ty. And I’ll get to reading

BITOGers, A review of the forum didn't get me there... What oil would you suggest to get rid of piston slap? Year 2000 GMC Sierra with the 6.0. I purchased it with 187k on the clock. P.O. used 5W-35 conventional oil on 3k OCI. Under my care, I switched to amsoil 0W-20 and a bottle of Ceratec...