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Engine Family

The EPA engine family name is a 12 character number/letter designation included on the engine nameplate for all heavy duty truck engines sold in the United States. In general, the nameplate is permanently affixed to the engine. The exact location and appearance of the nameplate varies by engine manufacturer. Examples of nameplates from three major engine manufacturers are included below. You must submit a legible photo of your engine plate with the application.
Caterpillar Nameplate (2 labels): EPA Family Name – 5CPXH0928EBK
Engine Model Year – 2005
Engine Horsepower – 475 HPV1.0 02/08/2010
Cummins Nameplate: EPA Family Name – 4CEXH0912XAJ
Engine Model Year - 2004
Engine Horsepower – 400 HP
Cummins Nameplate: EPA Family Name – XCEXH0855NAD
Engine Model Year – 1999
Engine Horsepower – 435 HP
Detroit Diesel Nameplate: EPA Family Name – 5DDXH14.0ELY
Engine Model Year – 2005
Engine Horsepower – 515 HP
Detroit Diesel Nameplate: EPA Family Name – XDDXH12.7EGL
Engine Model Year – 1999
Engine Horsepower – 500 HP
Mercedes-Benz Nameplate: EPA Family Name – 6MBXL12.8RJB
Engine Model Year – 2006
Engine Horsepower – 4500 HP