At Marc Nelson Oil Products, we pride ourselves on making sure we meet the needs of our customers. We carry DEF at our Salem location and can answer any questions you have regarding DEF.
If you don't see a product listed below, contact us and we will get you the information you are looking for, or recommend a product we carry that will meet your needs.
We carry the DEFendal™ Deisel Exhaust Fluid brand and the TerraCair® Ultrapure Diesel Exhaust Fluid. For more information and a complete understanding of Diesel Exhaust Fluids, visit www.discoverdef.com. Below is some additional information reviewing the basics of DEF and answering some questions you may have.
Diesel Exhaust Fluid, commonly known as "DEF", is a specific composition for the application in transportation to reduce the amount of nitrogen oxides (NOx) emitted into the air by diesel engines.
DEF is inserted into the diesel vehicle's exhaust stream, breaking down NOx (nitrogen oxide) emissions into environmentally friendly nitrogen and water.
The system inserting the DEF into the exhaust stream is called "Selective Catalytic Reduction," or "SCR" and can be found on diesel vehicle model years 2010 and later, from commercial trucks to pickups and SUVs. DEF is not an additive to the fuel and doesn't come in contact with the diesel fuel. DEF is stored in a separate tank and fed into the exhaust system. It is not advised to attempt to mix this fluid manually, the mix process is very specific.
Diesel Exhast Fluid Frequently Asked Questions (click here)
Can my driver accidentally put diesel fuel into the DEF tank?
To avoid this error, the industry standard for on-board DEF dispensing openings is smaller than that for diesel tanks. The nozzles at fuel islands for diesel fuel will not fit the on-board DEF tanks.
What happens if Diesel Exhaust Fluid gets too hot or too cold?
When DEF gets too cold there is no harm whatsoever to the shelf life of the fluid, however it will begin to freeze at 11�F. Trucks will start, and the tank will be heated until the solution starts to flow, and the driver is on his way. Storage for long periods at high temperatures can reduce the shelf life of the fluid. Temporary exposure to hot temperatures and sunlight do not have harmful effect on the fluid.
How much will I need and how big is my tank?
The average on-road tank size is 20 gallons, however they do vary depending on the application. They typically range from 6 to 30 gallons.
Do I change this fluid out, and how much do I need?
Since this fluid is consumed at a rate of 2-4% of diesel fuel, this fluid is refilled rather than replaced with other engine products such as antifreeze and engine oil. Tanks on board vary in size from 16-50 gallons in the largest trucks, with the average size around 20 gallons. The tank must have fluid in it to operate.
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