I've seen numerous threads here about which oils are OK to use in flat tappet and high performance engines. Most tend to recommend oils with high levels of ZDDP. A friend has a bunch of oils from the late 1990s. This prompted me to search for more info on ZDDP levels in today's oils. The link below, from 2015, provides interesting info on ZDDP oils and wear protection. Obviously, I have no information on the author's credentials.
Comments???
http://www.sccoa.com/forums/showthre...*Good-read***&