Built on Integrity,

Fueled by Trust

Cornerstone DEF Distributors provides reliable delivery of Diesel Exhaust Fluid, Marine AUS40, oil, fuel, antifreeze, coolant, windshield washer fluid, grease, and lubricants — serving the transportation, marine, and industrial sectors with trusted solutions that keep every mile and voyage clean, compliant, and running on time.

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Customer-First Focus

Every delivery is shaped around your satisfaction.

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Transparent, Fair Pricing

Clear costs with no surprise charges.

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Service You Can Count On

Consistent support, every mile and voyage.

Top-Tier DEF and Fluid Solutions

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DEF Deliveries (32.5% DEF)

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Marine AUS40 Supply (40% Marine Urea)

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Oil, Grease, Coolant & Antifreeze 

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Fuel Delivery

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Driven by Delivery Precision

We specialize in bulk deliveries, barge-to-vessel transfers, and full-service logistics for DEF, AUS40, fuel, oil, lubricants, antifreeze, coolant, windshield washer fluid, and grease. Our delivery solutions are built to serve transportation, industrial, and maritime operations with precision, speed, and care. Every order is timed, tailored, and ready to keep your operations flowing smoothly.

Let’s Keep Things Moving

Have questions about bulk delivery, marine transfers, or fluid logistics? Contact us today for fast answers, service details, or a custom quote tailored to your operational needs for DEF, AUS40, fuel, oil, lubricants, antifreeze, coolant, grease, or windshield washer fluid