I'm ready for my 500 mile oil change on my built motor. So do I need to put zinc additive in it? If so do I need to do it every change since all this new oil has less zinc in it?
If you are not running racing oil I would put a thing of zinc additive in every change.
There's no reason to on a Duramax. Guys usually run a zddp additive on flat tappet cams with higher spring pressures, but the Duramax is a roller cam. And even with aftermarket springs the seat pressure still isn't very high.
Depending on the OP's engine build and application, he should just run a high quality racing oil and not bother with additives. If it's a daily driver just put straight oil in it.
The more rpms, looser bearings, and heat a built motor has.
What oil are you running?
I run delo. But can only get the new stuff now
For the miles you drive, I'd run a good race oil like Brad Penn or Schaeffer's. Maybe even look into the Lucas Magnum HD oil, zinc is up around 1200ppm.
For people wanting high zinc for wider clearances you should look into running a 20/50 instead of 15/40 anyway.
How about Cen-Pe-Co? My new built motor is going to be assembled and ran on 20w50 Cen-Pe-Co.
very good oil, i would run it more if it could get it easier.
For the miles you drive, I'd run a good race oil like Brad Penn or Schaeffer's. Maybe even look into the Lucas Magnum HD oil, zinc is up around 1200ppm.
For people wanting high zinc for wider clearances you should look into running a 20/50 instead of 15/40 anyway.