Amsoil Synthetic engine oil or Royal Purple engine oil
Amsoil Full Synthetic engine oil or Royal Purple full synthetic engine oil? I have 2 quarts of Royal Purple Full synthetic engine oil but a freind of mine is a Amsoil dealer - Harley Davidson engine builder and swears by amsoil. He uses an Amsoil full synthetic oil specifically for air cooled engines. I wanna get this 23 HP Vanguard running today but at the same time I wan't the best engine oil money can buy.
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