[katyjevoich76]

I am just about to drain the break in oil out of my 454 i used non detergent 30 wt and the lucas cam break in additive until i read this i was planning on just adding some of the additive with each oil change but some one mentioned build up by doing that.not sure what to do now.what about shaffer synthetic oil ?does it have the zink or does it not need it because it is synthetic? because i know some people that swear by that stuff and they use it in everything from combines, to racecars, to machine tools.