very very common misconception about additives such as zinc, is that more is better when in fact anything over 1500ppm is useless. zinc and phosphorous fight for surface area and dont allow other additives such as moly to cling the part and do what is intended to do.Is the cam roller too? One of the big issues with synthetic is the lack of high pressure lubricants such as moly and zinc. I personally don't run synthetic unless the manufacturer or engine builder designed the engine for it. Check out bobistheoilguy on Google. He has more information on oils than you could ever need.