Prevent downtime with guaranteed delivery.
Safe, Reliable, CompliantDiesel Exhaust
Fluid (DEF)
Diesel Exhaust Fluid (DEF) Solutions
Certified Quality, Reliable Delivery, and Complete System Support
Corrigan Oil is a leading distributor of Blue Cap Diesel Exhaust Fluid (DEF) across Michigan, Ohio, Indiana, and Ontario. We combine unmatched supply reliability, API-certified quality, and specialized delivery systems to keep your fleet compliant, efficient, and moving forward.
What Is DEF and Why Does It Matter?
DEF is an aqueous urea solution (32.5% urea and 67.5% deionized water) used in Selective Catalytic Reduction (SCR) systems to convert harmful diesel exhaust emissions into harmless nitrogen, water, and CO₂. Without it:
- Engines enter derate mode or shut down.
- You risk hefty compliance fines.
- Using subpar DEF can damage your SCR system, leading to expensive repairs.
DEF isn’t optional; it’s essential for modern diesel engines and your business continuity.
Corrigan Oil: Your Complete DEF Partner
We do more than supply DEF—we provide full-service solutions for your operation:
- Certified Quality: Blue Cap DEF meets API standards, ensuring purity and performance for engine warranty protection.
- Flexible Supply Options:
- Bulk DEF Delivery for high-volume users
- Totes and 55-Gallon Drums
- 2.5-Gallon Jugs for smaller needs or backup supply
- Custom Equipment Solutions:
- Hand pumps
- Electric tote & drum pumps
- Bulk tank systems
- DEF metering systems
- Retail-approved DEF installations
Need DEF on every job site? Pair your DEF delivery with your fuel order for the ultimate convenience.
The Corrigan Advantage
Uninterrupted Supply
Specialized Handling
Dedicated DEF pumps and tanks to avoid contamination.
24/7 Availability
Emergency service when you need it most.
Handling & Storage Tips
Shelf Life
Up to 12 months if stored properly.
Temperature Sensitivity
Freezes at 12°F but is safe after thawing.
Avoid Contamination
Always use DEF-only equipment.
Need help setting up storage or pumping systems? Our experts can install turnkey DEF solutions tailored to your operation.
Common Questions About DEF
What is DEF made of?
32.5% urea and 67.5% deionized water—no additives or substitutes.
How much will I need?
On average, 2-4% of your diesel consumption.
Can I use water or other fluids instead?
No, only API certified DEF meets EPA and engine standards.
Ready for a Complete DEF Solution?
Corrigan Oil delivers Blue Cap API-certified DEF, specialized equipment, and expert support all from one trusted source. Let us handle your DEF needs so you can focus on your business.
