New England’s Leading Diesel Exhaust Fluid
(DEF) Distributor

Dennison Lubricants is the Original Manufacturer & Distributor of Diesel Exhaust Fluid (DEF) in New England

Service Area

Proudly Serving Diesel Exhaust Fluid (DEF) to Massachusetts, Rhode Island, Maine, Connecticut, New Hampshire, Vermont, & New York. Visit our Oilzum website for information by clicking the button below.

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Diesel Exhaust Fluid Equipment

Hand Pumps, Electric Tote and Drum Pumps, Bulk Tank Systems, DEF Metering Systems, Retail approved DEF Installations

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Product Data Sheet

Click the button below to download our most current Oilzum Diesel Exhaust Fluid data sheet.


Diesel Exhaust Fluid FAQ

What Is DEF?

DEF is a liquid solution made of urea and de-ionized water. In short, DEF’s purpose is to break down harmful diesel emissions into water & nitrogen through a process called selective catalytic reduction.


DEF works through a process called Selective Catalytic Reduction (SCR). This process uses a catalyst system in order to reduce the amount of harmful nitrogen oxide emissions that a diesel engine creates. In detail, the SCR passes the diesel exhaust fluid through the exhaust stream, a catalyst then converts the DEF into ammonia,  the ammonia then breaks down the harmful diesel emissions into nitrogen and water.

Do you have def equipment?

Yes! We have all the necessary equipment you need for DEF storage, and dispensing. Such as Tanks, Pumps, Hoses, Reels, and More.

Where is your def manufactured?

All of our manufacturing of diesel exhaust fluid is done locally at our Worcester Massachusetts facility at 7 Paul Clancy Way. 

Are you a Diesel exhaust fluid (DEF) distributor & manufacturer?

Yes! Dennison Lubricants is both a diesel exhaust fluid distributor and manufacturer. We have been a diesel exhaust fluid distributor since 2010, and a DEF manufacturer since 2014. We offer both bulk and package delivery of our diesel exhaust fluid to all of New England and parts of upstate New York.

Is your diesel exhaust fluid certified?

Our Oilzum diesel exhaust fluid (DEF) has a certification from the American Petroleum Institute (API). This certification recognizes that Oilzum diesel exhaust fluid meets the stringent quality standards that engine manufacturers service warranties require.  


Yes! We deliver throughout New England and deliver to parts of New York

Delivery Area:

  • • All of Massachusetts
  • • All of Rhode Island
  • • All of Connecticut
  • • All of New Hampshire
  • • All of Maine
  • • All of Vermont
  • • Hudson River Valley New York



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