I have access to "The Motor Oil Evaluator" which lists various oils by grade and Amsoil comes out on top (#1 [for diesel because it meets specs for diesel engine needs], #2 & #4) in the 5W30 category. Redline is #3 and Mobil 1 is #5. Royal Purple comes in at 40th. I cannot determine if the source of the information for TMOE is Amsoil related or independent.
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