A few things that stood out to me during my research on the subject
*There have been a number of oils that have come out with their own proprietary blend to replace the zddp. They keep it a very tightly held secret and its difficult to know if it will work for a flat tappet cam.
*Thus most of us including me go back to oils that have the zinc phosphate. I still use the Rotella T diesel oil, however I don't know it I would endorse it.
*The zddp was reduced because it reduces the effect of the catalytic converter.
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