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As environmental regulations tighten, Diesel Exhaust Fluid (DEF) has become a key component in modern diesel trucks. If you’re considering upgrading your fleet or adding a DEF-equipped vehicle, it’s essential to understand how DEF works—and why it’s now an industry standard. At Osco Tank & Truck Sales, we offer DEF trucks that balance performance and sustainability.
DEF is a non-toxic mixture of 32.5% urea and 67.5% deionized water. While urea occurs naturally, DEF is synthetically produced to ensure purity. It’s injected into the exhaust system of a diesel engine as part of the Selective Catalytic Reduction (SCR) process, where it converts harmful nitrogen oxides (NOx) into harmless nitrogen and water vapor—significantly reducing emissions.
Since 2010, the EPA has required diesel trucks to use DEF to meet federal emission standards. DEF systems reduce NOx emissions—pollutants linked to smog and respiratory issues—without compromising performance. In fact, SCR systems often improve fuel efficiency and engine power, making DEF trucks both cleaner and more capable.

Yes. Although there is an initial investment in DEF systems, they pay off over time. A tank of DEF can last up to 500 miles, and the fuel efficiency gains help offset costs. Plus, you’ll likely see improved engine performance and longevity.
Not at all—DEF systems are designed to work with your engine, not against it. In fact, many diesel operators report smoother operation, more horsepower, and fewer issues related to soot buildup. DEF doesn’t just help your truck meet regulations—it helps it run better.
At Osco Tank & Truck Sales, our DEF trucks are built with durability, performance, and compliance in mind. Need a custom build? We offer a variety of configurations, including models with a quick-draw feature that lets you pull water from lakes, ponds, or other sources—perfect for farm or industrial use. Our stainless steel tanks and proven engineering make our trucks a wise investment.

DEF trucks aren’t just a regulatory requirement—they’re a cleaner, more innovative way to run your fleet. If you’re ready to invest in long-term performance and environmental responsibility, Osco Tank & Truck Sales has the solution.
Contact us today to learn more about our DEF truck options.