| http://www.w3.org/ns/prov#value | - AMSOIL is manufactured in Superior and Superior is the world headquarters for AMSOIL. AMSOIL been producing synthetic lubricants since 1972.ok while i agree that some oils will not break down over that amount of time changing your oil sooner is a very good idea. not so much an issue for newer trucks but once your truck hits that five year, ten year old mark your trucks GOING to have comtamination.
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