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For a scientific look at the protection provided by engine oils do a search for "540RAT tech facts NOT myths" or go to "https://540ratblog.wordpress.com". The 2014 .pdf version I have is 187 pages long and has test results for over 180 oils in measurement of their film strength under real world conditions. Either 210 or 230 degrees F (my memory is foggy.) The engineer doing the tests is constantly up dating the test results. IIRC the top rated 25 oils were all synthetic, over 100k psi film strength. Again IIRC, Rotella's film strength was in the 70k psi range. ZDDP content and viscosity showed no one to one relationship to film strength.
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