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Keep your fleet Running responsibly

Diesel Exhaust Fluid (DEF) has become a necessity to run your medium and heavy-duty diesel vehicles. Luckily, we have multiple options to get you the high-quality DEF you need exactly when and where you need it.

The team at STERN offers convenient, secure deliveries of our high-quality DEF at wholesale prices to keep your fleet in action.

About DEF

Diesel exhaust fluid was created in response to the 2010 Diesel Emissions Standards required by the EPA. DEF, combined with Selective Catalytic Reduction (SCR) technology, is used to reduce pollution from diesel vehicles and equipment by more than 90%. DEF is non-toxic, non-polluting, non-hazardous, and non-flammable.

The vast majority of engine manufacturers prefer SCR technology, making DEF a necessity when operating heavy equipment. Without proper fluid levels, your trucks will stop working and could potentially void any warranties you may have on your equipment.

Bulk DEF

Let our fleet of reliable trucks deliver DEF directly to your facility or job site. STERN has DEF packaged and ready to deliver to businesses across our full territory, including all of South Dakota and Nebraska and counties in eastern Wyoming, northwest Iowa, and southwest Minnesota. 

DEF Equipment

STERN supplies storage tanks, dispensing systems, and totes. Already have equipment? We’d be happy to evaluate your current system to make sure it’s the best fit for your needs.

Quality Matters

We are committed to safely and effectively supplying you with high quality DEF products. Contaminants can cause harm to your DEF system. That is why STERN limits the transfers of DEF and only handles product through certified micromatic fittings that prevent contamination from coming in contact with the product or your system.

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