Air Cooled Engne Oils

[effvee]

Hi everyone, I talked to a machinist this past weekend, I've been having oil pressure problems.Our topic digress to oil additives, since he was looking at our entire engine for possible problems and oil supply and pressure. he noted our cam lobs, reminded us that we should add zinc while breaking in the engine. he sell small containers pint size, more like 6 ounces of zinc additive. Has anyone ever heard of zinc additive? also he stated that the zinc was only needed during break in.