TOP TIER™ Diesel Fuel
Introduced in 2017

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

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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. 

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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 additive packages and good housekeeping practices 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)

• provide increased protection against water and particulates introduced into the fuel before being dispensed into the vehicle or equipment.


Today’s diesel engines typically utilize high pressure common rail (HPCR) technology and HPCR engines will benefit from the TOP TIER™ diesel fuel properties developed by a consortium of light-duty and heavy-duty diesel original equipment manufacturers (OEMs).  Retailers offering diesel fuel and biodiesel blends meeting the TOP TIER™ diesel requirements display the TOP TIER™ diesel logo at dispensers.