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Illustration showing diesel exhaust fluid pump sign and EPA headquarters
Newsby Deborah LockridgeAugust 12, 2025

EPA Acts to Curb Sudden DEF-Related Diesel Engine Derates

New guidance to engine manufacturers will reduce "derating," an automatic trigger forcing diesel engines to operate at a reduced capacity when the emissions system runs out of diesel exhaust fluid or there's a DEF-related fault.

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ArticlesJune 16, 2025

Don’t Let Bad DEF Sideline Your Truck: Storage, Shelf Life & Safety Tips

Diesel exhaust fluid doesn’t last forever. Before restarting an idle heavy-duty diesel truck or using DEF from storage, make sure it’s safe, compliant, and won’t damage your emissions system.

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NewsMarch 22, 2009

Navistar, Competitors Continue Sparring Over SCR

The word-war over the two paths being taken to meet 2010 exhaust limits by North American truck and engine builders continued at the Mid-America Trucking Show.

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