A few years ago, barely a thread would go by without mentioning AutoRX clean and rinse phases, the mythic qualities of German Castrol, and the cheerleading for conventional Havoline motor oil. But I never remember seeing any threads about how or why these products fell out of favor. Is this just typical fad-like phases of product loyalty, or was there some juicy oil industry scandal that rocked the stalwarts from their lofty pedestals? These days it seems to be MMO and PP. Did stuff just get better and the old darlings surpassed?