DES MOINES, Iowa ( IOWA CAPITAL DISPATCH ) - John Deere announced Tuesday all of its Tier 4 diesel engines were approved for B30 fuels, a fuel blend with up to 30% biodiesel.

Iowa Renewable Fuels Association called the action a “major step” toward renewable fuel adoption, especially for producers in Iowa who have several B30 incentive programs.

The adoption means that farmers can use the higher-blend fuel in their agricultural equipment like tractors and combines, which typically use the heavy-duty engines. Previously, John Deere rated these tier-4 engines for B20, or 20% biodiesel, fuel blends.

IRFA executive director Monte Shaw said in a press release that John Deere “has always been a leader in promoting renewable fuels.”

The tier rating is a system designed by the U.S. Environm

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