I don't know if this has been discussed here or not, but I believe if it has not it is worth mentioning. I ran across an article about the new oils that are lacking zddp, zinc dithiophosphate, an additive that is important in protecting against extreme pressure friction in engines, specificially the type encountered by a camshaft with flat tappets. The complete article is at:
www.ttalk.info/zddp.htm. I believe there may be something to this, and for those of us with engines that do not have roller camshafts, it would be prudent to at least get more information about this to avoid trouble in the future.
