Lower - priced brands often use only the
minimum, but the so - called Top Tier brands use more
detergents, and some vehicle manufacturers recommend them because
of that.
Eight
of the world's top automakers, BMW, General Motors, Fiat Chrysler Automobiles, Honda, Toyota, Volkswagen, Mercedes - Benz and Audi recognized that the current EPA
minimum detergent requirements do not go far enough to ensure optimal engine performance, so they created TOP TIER ™ which raised the bar to an additive level that is better suited for vehicle performance.