I recently purchased a 1965 flat tappet 289 mustang. Engine recently rebuilt with less than 1000 miles on it now. Engine shop was a racing engine shop that used Brad Penn break in oil and Brad Penn general 10w30 oil after break in with appropriate zinc levels I just learned. I recently changed the oil before putting car away for winter using mobile 10w30 synthetic (rookie mistake). Car ran on that oil on 3 different occasions with total run time less than 40 minutes and about 15 miles (half ideal time)
After being informed about the importance of Zinc levels on flat tappet cams I immediately changed oil back to Brad Penn appropriate zinc protection.
My question is for that short amount of time the engine ran on the mobile 1 synthetic could I have done any significant damage to the cam lobes due to less than recommended zinc levels in mobile 1 (900ppm or so)?
After being informed about the importance of Zinc levels on flat tappet cams I immediately changed oil back to Brad Penn appropriate zinc protection.
My question is for that short amount of time the engine ran on the mobile 1 synthetic could I have done any significant damage to the cam lobes due to less than recommended zinc levels in mobile 1 (900ppm or so)?