Don Shillady is a respected member of the board here at CHR. He is also a PhD Chemist and Professor and rates all the respect I can muster.

Don did extensive research when this ZDDP elimination in oils reared its ugly head and came on here to recommend a commercially-available oil additive that he had discovered.
http://www.sfrcorp.com/product/sfr-1...-oil-fortifier

Directions are 1 1/2 ounces to each quart of oil for cam break-in and 1 ounce to each quart of oil with subsequent changes. I used it to break in the cam in the 6-banger Ford motor I rebuilt last year and all is well so far. I now use it in all my rolling stock. Now, I just buy what's on sale for oil and put the SFR in with it. As the Aussies would say, no worries mate.