TOP TIER™ Licensing Program

TOP TIER™ Detergent Gasoline

TOP TIER™ Detergent Gasoline was first introduced in 2004 when a group of automakers recognized the need for a higher detergency gasoline standard than that required by regulation.

Fuels with lower-quality additive packages can build up deposits on fuel injectors and on intake valves. Others can build up deposits in combustion chambers and may lead to intake valve sticking. These lower levels of additives can have negative impacts on engine performance and vehicle responsiveness.

Ten top automakers have raised the bar. TOP TIER™ Detergent Gasoline helps drivers avoid gasoline which may leave deposits on critical engine parts, reducing engine performance and in some cases, engine damage. That's something drivers and automakers can get behind.

TOP TIER Detergent Gasoline is sponsored by BMW, General Motors, Fiat Chrysler Automobiles, Honda, Toyota, Volkswagen, Mercedes-Benz, Navistar, and Audi.
TOP TIER Program

TOP TIER™ Diesel Fuel

TOP TIER™ Diesel Fuel was introduced in 2017 by a consortium of automotive and equipment manufacturers using diesel engines.

TOP TIER™ Diesel Fuel was developed to provide better performance, in turn helping the diesel fuel retailers, auto and engine manufacturers, and particularly those who drive or use diesel-powered equipment.

Relative to the ASTM D975 and D7467 specifications for diesel and biodiesel blended fuel in the U.S., the TOP TIER™ Diesel Performance Standard requires detergents to:
• reduce deposits on the fuel injectors (both internal and external),
• improve lubricity (less wear on injectors and in the engine)
• improve fuel stability (less deposits in the fuel system components)
• and provide increased protection against water and particulates introduced into the fuel before being dispensed into the vehicle or equipment.

TOP TIER Diesel Fuel is sponsored by General Motors, Volkswagen, Detroit Diesel, and Navistar.