The Environmental Protection Agency (EPA) has issued new guidance to diesel engine manufacturers designed to prevent sudden ...

Diesel engines can be more efficient than gasoline engines, but that's largely due to DEF. Here's what it does, how it helps, and what happens if you run out.

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 ...

Starting in 2027, manufacturers will be expected to produce engines that implement a gradual reduction of power to the ...

You've surely heard of brake fluid, fuel, and lots of other liquids needed to run a diesel vehicle. But what's AdBlue fluid? And do all diesel vehicles need it?