put clean oil to start, it isn't nearly as expensive as rebuilding one of these engines. As the other fella mentioned, study up on the government oversight regarding zinc levels, now I know why all the car companies are going to roller cams... its not for high performance, it is for poor government performance. Anyway most all of the major cam companies have info on zinc levels needed for break-in, and for running under various conditions. Doing a bit of searching on the interweb will give you reams of information on this.
