2.5+ Gallon Jug - Diesel Exhaust Fluid

More DEF, Less Hassle – We Don’t Ship Air!

At DEFinitive, we don’t cut corners—we fill them. Our 2.5+ gallon jugs go beyond the industry standard, ensuring you get every last drop of high-purity DEF. Unlike competitors who leave empty space, we believe in full measure—just like it should be.

Maximized Purity = Maximized Performance

Not all DEF is created equal. Lower-grade DEFs contain dyes and additives that can cause buildup, sensor failures, and costly repairs. Our ultra-pure blend of deionized water and 37.5% urea keeps your system running clean, reducing maintenance costs and protecting your engine for the long haul.

Your Choice Drives Change

Every purchase of DEFinitive DEF provides a full year of safe drinking water to someone in need. With every mile you drive, you’re not just reducing emissions—you’re making a global impact.

✔ More DEF per jug – We don’t short-fill. Your cup runneth over.
✔ Engine protection & lower maintenance costs – Clean DEF means fewer problems.
✔ A mission-driven choice – Your purchase funds safe water initiatives worldwide.

Drive with purity. Impact the world.