Prestone Command DEF (Diesel Exhaust Fluid) is a liquid reducing agent developed for use in all diesel engines that are equipped with a Selective Catalytic Reduction (SCR) system.

Prestone Command diesel exhaust fluid (DEF) is a colorless, odorless, nontoxic and nonflammable liquid solution consisting of 67.5% demineralized water and 32.5% high-quality automotive-grade urea. It ...

Aftermarket Prestone Offers Command Testing Kit for Coolant, DEF December 3, 2014 • Prestone Products Corp. • ...

"Prestone has a new owner and we've set a new business strategy, and the heavy-duty aftermarket is a very significant piece of that," said Tim Shipley, director of sales. The patented Prestone ...