Compare HTHS, Visc at 100, and NOACK against other oils. Besides what redline says about their oils, they excel against all other oils in the field in all 3 categories. If your oil is not excelling in these areas, I would tend to doubt it is 100%. I certainly welcome any oil that wants to use esters. I get my redline 5w30 off ebay for 9.95 a qrt shipped free, 5w20 I get even cheaper most of the time. To be honest I would prefer to use costco deal m1, but redline is the only oil gonna keep hemi tick away.