Keep your diesel truck running strong with BlueDEF® and BlueDEF Platinum®. Engineered for ultimate purity and built to help your engine go the distance. 

The new and improved triple-filtered formulation delivers the purest diesel exhaust fluid money can buy. Rigorous lab testing removes all contaminants, and the specially sterilized spout prevents purity issues before they start. 

Keep life in drive with America’s #1 DEF Brand. Whether you're a daily do-er, a weekend warrior, an off-roader, or an open-roader, one thing is certain: when you rely on your vehicle, your vehicle relies on you. That's why choosing the right diesel exhaust fluid matters. PEAK® BlueDEF® isn't just any DEF; it's engineered for ultimate purity and performance. 

Why settle for less when your engine deserves more? BlueDEF® products are guaranteed pure to help keep your diesel truck running strong, mile after mile. And if you're looking for next-level performance, BlueDEF Platinum® delivers. Its proprietary formula is designed to prevent harmful deposits and extend the life of your Selective Catalytic Reduction (SCR) system. That means fewer repairs, less downtime, and more time doing what you love. After all, the easiest repair is the one you never have to make. 

Every BlueDEF® product meets the strict standards set by the American Petroleum Institute (API) for diesel exhaust fluid. This certification ensures that BlueDEF® delivers the precise purity and composition your engine needs to comply with emissions regulations and perform at its best. 

No matter what you set out to do, keep life in drive with triple-filtered, guaranteed pure BlueDEF® products.  

Guaranteed for what drives you.

Give your diesel truck the premium treatment. BlueDEF Platinum helps prevent deposits and keeps your engine running its best for the long haul.