DEF stands for diesel exhaust fluid, and it is mandatory for all semi-trucks to use it in the United States. Here's why and ...

For most diesel-powered engines, DEF is vital so the vehicle performs at its best. Here's what it is exactly and what the ...

Problem: DEF Contamination. Dirt, rust and other particles can cause abrasion on internal components. Having too much or too ...

Diesel engines need a special sauce to keep their emissions from being too nasty: DEF, or diesel exhaust fluid. It's a mix of deionized water and urea ... Most modern diesels won't even start without ...

I t's long been said that discussions concerning religion and politics are best avoided at the dinner table or in polite company. The same holds for any topic that includes best m ...