65Dream

I recently purchased a 1965 Mustang 289. Engine completely rebuilt with about 1,000 miles on it. Had been built by racing engine shop Brad Penn break in oil and brad penn general oil used to ensure appropriate zinc levels I have since found out. Problem is I changed oil using Mobile 1 10/30 regular synthetic which has low zinc levels…900PPM or so. The car had about 40 minutes total run time with new Mobil 1 oil (and about 3 starts). AFter I changed the oil I then heard someone talking about zinc levels and quickly realized I should have stayed with the Brad Penn.

I have changed back to Bran Penn now but my question is does anyone think I significantly harmed by cam with that short run time before I changed the oil back?

Mustangdemon67

It Should be fine. They sell zinc additive at places like summit. Zddp I think it's one brand but there's others. I don't recall but that Lucas oil additive might have some too? Might want to double check that.

1967Roadster

You should be ok, I use Rotella diesel 50 wt