Diesel Exhaust Fluid in Texas, Arkansas, Louisiana & Oklahoma
What Is Diesel Exhaust Fluid (DEF)?
Diesel Exhaust Fluid (DEF) is a crucial component in modern diesel engines, designed to reduce harmful emissions and meet environmental regulations. DEF is a non-toxic, colorless liquid that plays an essential role in the Selective Catalytic Reduction (SCR) system, helping to break down nitrogen oxides (NOx) into harmless nitrogen and water vapor.
At Red River Oil Company, we provide high-quality DEF diesel exhaust fluid to businesses and fleets across Texas, Arkansas, Oklahoma, and Louisiana, ensuring compliance with emissions standards while optimizing engine performance.

Benefits of Diesel Exhaust Fluid (DEF)
Using diesel exhaust fluid offers several advantages, making it an essential component for diesel-powered vehicles and machinery:
- Reduces Harmful Emissions – DEF significantly lowers NOx emissions, improving air quality and meeting EPA standards.
- Enhances Fuel Efficiency – Vehicles equipped with SCR systems using DEF consume fuel more efficiently, lowering operating costs.
- Extends Engine Life – DEF helps reduce carbon buildup in engines, leading to longer-lasting components and lower maintenance expenses.
- Ensures Regulatory Compliance – Many industries, including transportation and agriculture, must use DEF to meet emission regulations.
- Minimizes Environmental Impact – By converting NOx into harmless nitrogen and water, DEF contributes to a cleaner environment.
What Is the Purpose of Diesel Exhaust Fluid?
The primary purpose of diesel exhaust fluid is to reduce NOx emissions produced by diesel engines. When injected into the exhaust stream, DEF triggers a chemical reaction in the SCR system, breaking down pollutants before they are released into the atmosphere. This process helps diesel engines comply with strict emission regulations while maintaining optimal performance.
Without DEF, diesel vehicles would release excessive pollutants, leading to environmental damage and potential regulatory fines for non-compliance.
What Is Diesel Exhaust Fluid Made Of?
Many people ask, “What is diesel exhaust fluid made of?” The answer is simple: DEF consists of 32.5% high-purity urea and 67.5% deionized water.
This precise mixture ensures the proper chemical reaction needed to convert NOx emissions into nitrogen and water vapor. The high-purity urea in DEF is a synthetic compound similar to natural urea found in fertilizers, making it safe to handle when used correctly.
Pros and Cons of Diesel Exhaust Fluid (DEF)
Just like anything else in life, there are pros and cons when it comes to diesel exhaust fluid. Learn about the advantages and disadvantages of DEF.
Pros of DEF
Some of the pros of diesel exhaust fluid include the environmental benefits it provides, improved fuel economy, and more:
- Environmental Benefits – DEF helps diesel engines run cleaner, reducing air pollution.
- Improved Fuel Economy – Engines using SCR and DEF consume less fuel compared to non-SCR models.
- Engine Longevity – Reduced carbon buildup leads to fewer mechanical issues and longer engine life.
- Regulatory Compliance – Ensures businesses meet emission standards, avoiding fines and penalties.
Cons of DEF
Just as there are advantages when it comes to DEF, there are also some disadvantages, including the following:
- Additional Maintenance – DEF systems require proper handling and storage to prevent contamination.
- Freezing in Cold Weather – One common concern is, “Does diesel exhaust fluid freeze?” Yes, DEF freezes at 12°F (-11°C). However, most modern diesel vehicles have built-in heating systems to prevent freezing issues.
- Cost Factor – Purchasing DEF adds an extra operating cost, but this is often offset by improved fuel efficiency.

5 Key Facts About Diesel Exhaust Fluid
Learning some key facts about diesel exhaust fluid can help you determine whether it’s right for you. Feel free to contact us if you have any questions.
- DEF is non-toxic and safe to handle, but it should be stored in a clean, sealed container to avoid contamination.
- DEF consumption is proportional to fuel usage—typically, diesel engines use about 2-3% DEF for every gallon of diesel burned.
- DEF should never be mixed with diesel fuel—doing so can cause severe engine damage. It has a dedicated tank separate from the fuel system.
- Proper storage is essential—DEF should be kept in a cool, dry place to maintain its effectiveness. Exposure to extreme heat can degrade its quality.
- DEF availability is increasing—many fuel stations, truck stops, and suppliers now offer DEF, making it easier for fleets and businesses to stay compliant.
Contact Red River Oil Company for Diesel Exhaust Fluid
Ensuring your business has access to high-quality DEF diesel exhaust fluid is essential for maintaining engine performance and regulatory compliance. Red River Oil Company provides reliable DEF supply services to businesses and fleets across Texas, Arkansas, Oklahoma, and Louisiana. Get in touch with us today to learn more about our DEF solutions and how we can help keep your diesel engines running efficiently while meeting emissions standards.