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Message: <blockquote data-quote="Shadowrider" data-source="post: 2220250" data-attributes="member: 3099"><p>Wolf, I am an Amsoil dealer and have been using just about everything they make for about 15 years now.  The Mobil 1 Extended Performance is the same group IV base stocks as Amsoil.  Amsoil beats them by using a better additive package, much better in a lot of cases.  Now the Mobil 1 oils that are not in the "Extended Performance" line are just group III hydrocracked base stocks.  The reason I used Mobil 1 for this test is because it's readily available at wally world and such.</p></blockquote><p></p>