The Environmental Protection Agency is changing regulations about diesel engines that could help Oklahoma farmers and truck drivers.

The rules have to do with Diesel Exhaust Fluid. The EPA began requiring DEF in all nonroad vehicles in 2008, including agricultural, construction and mining equipment.

What is Diesel Exhaust Fluid (DEF) and why it matters in Oklahoma?

The EPA began mandating DEF on all new on-road heavy-duty vehicles used on highways in 2010. By 2015, all new on-road heavy-duty trucks, including heavy-duty pickup trucks and vans, work trucks, buses and combination tractors were required to use DEF to control emissions.

How past EPA rules hurt farmers and truck drivers

The problem was that if a vehicle ran out of DEF, the engine suddenly lost power, causing a hardship for

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