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AMSOIL vs. Royal Purple


AMSOIL has Better Cold Crank, Lower Pour Points (ASL & ATM)  , Lower Viscosity, Better Wear Protection, Higher TBN, Better Viscosity Stability (ASL & ATM) than Royal Purple








The National Advertising Division of the Council of Better Business Bureaus recommended Porter, Texas-based Royal Purple modify or discontinue numerous advertising claims for its synthetic motor oil, following a challenge by Wayne, N.J.-based BP Lubricants. The NAD examined comparative performance and superiority claims in print, broadcast and Internet advertising. In some of the advertising, Royal Purple compared its performance to Castrol, Shell, Amsoil and other motor oil brands.
NAD recommended that Royal Purple discontinue its use of consumer testimonials reporting specific performance attributes in the absence of reliable independent evidence showing performance capability.
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