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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