Quote:
Originally Posted by Navy Horn 16
I've been running Howard's roller hyd lifters.. They have always worked well, but been noisy. I switched from Mobile1 10w30 to AMSOIL 10w30 Z-Rod, for no reason other than it was on sale and I knew the zinc wouldn't hurt anything. My lifter noise went away pretty much instantly.
It doesn't make any sense to me that a high zinc oil designed to protect flat tappet cams would make noisy roller lifters suddenly quiet. I do know that I've stumbled into enough problems, so I'm not going to argue with an accidental solution. Give it a shot.
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That's what I also found by accident with a flat tappet cam I ran, using the same viscosity, that I mentioned earlier. I'm not sure of the reason other than the additive packages vary among manufactures, not the zinc specifically but the additive package as a whole.