Bob Olree at one time was the top fuels and lubricants guy at GM Powertrain Division. At one time he was also Chairman of ILSAC. I interviewed Bob several times during is last few years at GM before he retired including one final interview in '08 while researching a story on--who'd a thunk it--engine oils and camshaft/lifter failures in pushrod engines with flat tappet cams. That article is at:
http://www.corvetteactioncenter.com/.../#.UV5FyHCubd4
A year or so later, Olree retired.
Olree's comments about what happens when too much ZDP is used is being ignored by many...especially the freakin' morons who are marketing all the ZDP additives.