I am used to running rollers, but I am building a hydraulic cam motor for a friend. Are you supposed to always use zinc additive after break in? After the first 1,000 miles or so, is it ok just to run a synthetic oil like Mobil 1 or Castrol Syntec without zinc additive?
It's always going to need the zinc whether it's in the oil being used or added to the oil without zinc.
