Quote:

15w40 Rotella, Delvac or Delo 400 has enough zinc in it (not as much as it used to but enough. 11-1200ppm IIRC. used to have 1600) and you can get it at any Walmart cheap. Have someone turn the engine over with a bar while you watch the lifters to make sure they ALL rotate in their bores. Replace any that don't turn. If the motor is all buttoned up, unbutton it and verify they turn. If you fire it and one isn't turning your cam will be flat in about 10 seconds and it will do it no matter what kind of oil you had in it.

Kevin



This is quite possibly the biggest reason for failed flat tappet cams that people overlook.
Lifter Rotation.