PEAK BlueDEF Diesel Exhaust Fluid is a mixture of high purity synthetic urea and deionized water that is used in Selective Catalytic Reduction (SCR) systems in diesel vehicles. DEF is used to help convert NOx to harmless nitrogen and water.

Product Features:

• BlueDEF's Purity Guarantee is our assurance the DEF your are purchasing has been tested to meet or exceed the strictest OEM standards
• America's No. 1 brand of Diesel Exhaust Fluid
• Conforms to the ISO-22241-1 specification for DEF, and is an American Petroleum Institute (API) certified diesel exhaust fluid
• Compatible with all diesel SCR systems
• Non-flammable formula makes handling safe and easy