Quote:
Originally Posted by cadillac_al
In oil wear tests the amount of ZDDP doesn't seem to matter. Oils high in ZDDP allow more wear than other oils with less ZDDP. It's mostly a placebo effect now. Most of the flat cams people get are most likely from inferior quality steel or stiff valve springs. Of course the cam companies will want to blame the oil. Here is a good read on oil and wear testing.
https://540ratblog.wordpress.com/201...-test-ranking/ |
Oil has changed as the new automobile engines have changed. Roller lifters and emission controls have made certain additives in oil go away. The different API ratings are because of this. The Camshaft and Lifter wear problems on hydraulic and solid lifter flat tappet cams IS caused by the use of newer API rated oils without the proper additives in them. This is even more pronounced with the use of higher lift & higher spring pressure performance cams. It has NOTHING to do with the quality of the cams it is only because of the difference in the oil used. The cams have not changed the oil has.