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Diesel Exhaust Fluid

Diesel Exhaust Fluid (DEF) keeps your diesel engines running efficiently and meeting emissions standards. DEF is an essential fluid for reducing harmful nitrogen oxide emissions from diesel vehicles, ensuring both environmental compliance and optimal engine performance. Whether you're maintaining a fleet or managing a single vehicle, our DEF products are designed to support clean and efficient operations, helping you stay on the road longer and cleaner. Explore our range of reliable DEF options and find the perfect match and volume for your needs.

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2 Sizes Save up to 24% Save %

RL-2 Diesel Additive - Choose Size

Red Line Oil
$1,149.84 - $1,967.84
$1,149.84 - $1,967.84
$1,149.84
$880.99 - $1,495.99
$880.99 - $1,495.99
$880.99

Red Line® RL-2 Diesel Ignition Improver is formulated for injectors, pumps, and rings - providing both a cleaning treatment and lubrication as part...

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2 Sizes Save up to 32% Save %

85 Plus Diesel Fuel Additive - Choose Size

Red Line Oil
$925.92 - $1,967.84
$925.92 - $1,967.84
$925.92
$602.99 - $1,339.99
$602.99 - $1,339.99
$602.99

Red Line® 85 Plus Diesel Fuel Catalyst is designed for use in all diesel engines. This specialized formula compensates for latest low-sulfur fuels ...

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DEF Common questions

What is DEF?

DEF is a clear, non-toxic, non-flammable liquid that's injected into the exhaust stream of a diesel engine. It's stored in a separate tank, usually located next to the diesel tank.

Diesel Exhaust Fluid (DEF) is a precise mixture of urea and de-ionized water that is used in the SCR process. DEF is 32.5% urea and 67.5% de-ionized water, this mixture is very precise when blended.

Is DEF considered hazardous?

No, DEF is less hazardous than other fluids used in a truck, like diesel, brake fluid, and antifreeze. It's biodegradable and can be transported without a hazardous substance placard.

How do I store DEF and how long does it last?

Store DEF in a cool, dry, well-ventilated area in a container designed for DEF. Avoid storing it outdoors or in containers made of carbon steel, aluminum, copper, or zinc.

DEF can last at least one year if stored between 10° and 90° Fahrenheit. Storing it at 75° Fahrenheit can extend its shelf life to two years.

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