I just discovered the 540RATBLOG on motor oils. His testing shows that high zinc/phosphorous motor oils may not be the best indicator of protection for flat tappet engines. The testing on wear judged by psi breakdown shows that some oils without the 1,000+ zinc levels are better than those with. Basically, the zinc/phosphorous levels are irrelevant. Is there anything wrong with his analysis? Any reason to doubt it? If its for real, then why not pick one of the top ten or twenty oils and not worry about the on-going reductions in zinc and phosphorous? Any thoughts? I am not a chemical engineer so I can't comment on the validity of the tests so that is why I am asking this forum.