Skip to Content
Keller-Heartt has Truegard Propylene Glycol Heat Transfer Fluids in both Inhibited and Food Grade! Order Today!
Propylene Glycol Available. Order Today!
Request a Quote B2B Account Program Government Sales Shipping Policy
Blue DEF 2.5-Gallon Case Premium Diesel Exhaust Fluid

Blue DEF 2.5-Gallon Case Premium Diesel Exhaust Fluid

by BlueDEF
SKU 9874152
$43.73 - $43.73
$43.73
$43.73 - $43.73
$43.73

Diesel exhaust fluid is one of the key elements of the Selective Catalytic Reduction (SCR) process used by most medium and heavy-duty engine builders to meet EPA 2010 regulations. BlueDEF is a non-toxic solution of 67.5 percent purified water and 32.5 percent ultra pure automotive grade urea. BlueDEF is not a fuel or fuel additive. Instead, when injected into the exhaust stream and passed over a catalyst, BlueDEF helps convert NOx into nitrogen gas and water vapor, two harmless and natural components of the air. BlueDEF is stable, colorless and odorless, and meets ISO Standards 22241 for purity and composition and is an American Petroleum Institute (API) certified diesel exhaust fluid. These are the highest quality and safety standards in place to ensure optimum SCR performance. Making sure you do not run out of BlueDEF in a SCR equipped truck is simple, watch the Diesel Exhaust Fluid (DEF) gauge, which is part of the diesel fuel gauge, for when it is time to refill. DEF is stored in a dedicated tank next to the fuel tank on the driver's side. The tanks range in size from 6 to 23 gallons depending on the truck's application. The DEF tank fill opening is designed to accommodate a DEF fill nozzle to ensure only DEF is put into the tank. A diesel fuel nozzle will not fit into the DEF tank opening. There may be a $75 liftgate fee if delivery requires a liftgate from the carrier.

Buy DEF in Bulk

BlueDEF diesel exhaust fluid from Peak is the first choice of many American automakers, dealerships, and mechanics because it outperforms competing technology and provides essential ingredients for the performance and lifespan of an exhaust after-treatment system. BlueDEF is made from the purest ingredients, it works hard to purify your emissions and leads the field in environmentally friendly solutions for diesel vehicles. 


At Keller-Heartt, we are proud to offer BlueDEF diesel exhaust fluid in 2.5 Gallon Cases. The size is perfect for tucking in a niche of your shop, your garage or your hangar to ensure that our diesel exhaust fluid option is ready when you need it. This non-hazardous diesel exhaust fluid is ready to ship.

Show More Less
Product Data Sheet
Safety Data Sheet

Product Specs

  • Application
    Diesel Trucks, Diesel Fleets
  • Availability
    Ships within 24 hours
  • Contents
    Diesel Exhaust Fluid
  • Package Size
    2.5 Gallon Case
  • Product ID
    168-2
  • Purity Details
    Fewer than 0.5 ppm of heavy metals such as iron and aluminum. Fewer than 0.2 ppm of copper, zinc and chromium. With low phosphates and no more than 20 ppm of insoluble matter.
  • Purity/Concentration Standards
    AUS 32, DIN 70070 and ISO 22241
  • Urea Concentration
    32.5%, +/- 0.7%
  • Weight (Per Package)
    2.5 Gallon Case

Frequently asked questions

Find answers to common questions about our products and services

  • BlueDEF is designed for diesel trucks and diesel fleets equipped with Selective Catalytic Reduction (SCR) exhaust after-treatment systems. It is used by most medium and heavy-duty engine builders as a key element of the SCR process.

  • BlueDEF is not a fuel or fuel additive — it is injected directly into the exhaust stream, where it passes over a catalyst and helps convert NOx emissions into nitrogen gas and water vapor, two natural components of air. It plays no role in combustion and is stored in a completely separate dedicated tank.

  • Monitor the DEF gauge, which is built into the diesel fuel gauge cluster on SCR-equipped trucks. DEF is stored in a dedicated tank on the driver's side next to the fuel tank, and tank sizes range from 6 to 23 gallons depending on the truck's application.

  • SCR systems require a precise urea concentration to function correctly — too high or too low can impair catalyst performance. BlueDEF delivers 32.5% ultra-pure automotive grade urea (+/- 0.7%), and meets the tight purity thresholds defined by AUS 32, DIN 70070, and ISO 22241: fewer than 0.5 ppm of heavy metals such as iron and aluminum, fewer than 0.2 ppm of copper, zinc, and chromium, low phosphates, and no more than 20 ppm of insoluble matter.

  • No — the DEF tank fill opening is specifically engineered to accept only a DEF fill nozzle. A standard diesel fuel nozzle will not fit into the DEF tank opening, making accidental misfueling essentially impossible by design.

  • Yes — BlueDEF is a non-toxic, non-hazardous, stable, colorless, and odorless fluid. Its composition is 67.5% purified water and 32.5% ultra-pure automotive grade urea, making it safe to store in a shop, garage, or hangar without special hazardous-material precautions.

Key Features

  • Engineered for Selective Catalytic Reduction (SCR) systems used by most medium and heavy-duty engine builders to meet EPA 2010 regulations, converting NOx into harmless nitrogen gas and water vapor.

  • Ultra-pure, non-toxic formula composed of 67.5% purified water and 32.5% automotive-grade urea, with a urea concentration of 32.5% (+/- 0.7%) for consistent SCR performance.

  • Meets AUS 32, DIN 70070, and ISO 22241 purity and concentration standards, and is American Petroleum Institute (API) certified diesel exhaust fluid.

  • Stringent purity control: fewer than 0.5 ppm of heavy metals such as iron and aluminum, fewer than 0.2 ppm of copper, zinc, and chromium, and no more than 20 ppm of insoluble matter.

  • Stable, colorless, odorless, and non-hazardous formula suited for diesel trucks and diesel fleets, packaged in a convenient 2.5 Gallon Case.