The Premier choice for Diesel Exhaust Fluid

Diesel Exhaust Fluid (DEF) is an ultra-pure urea solution that acts as a reductant. It is carried in a separate tank, and is then injected into the hot exhaust stream and absorbed onto a catalyst. It is of 32.5% high-purity urea and 67.5% deionized water. The purpose of DEF is to reduce Nox concentration in the exhaust emissions produced by diesel engines. The process by with the NOx emissions are reduced is called Selective Catalytic Reduction (SCR).

DEF is an aqueous urea solution whose specifications are regulated by standard ISO 22241 70070. It is a non-toxic, nonflammable, non-hazardous and non-explosive substance.

Retail and Wholesale

Precision Hydraulic & Oil offers DEF fluid in bulk and at wholesale prices for shops and large businesses that require larger supply of DEF fluid. 


Precision hydraulic and oil logo

Precision Hydraulic & Oil provides high quality DEF Fluid products but also strives for superior service. We understand the importance of good working relationships, accountability, reliability and the belief of delivering on our promises. Our people are committed to taking care of customers and making the sacrifices to achieve the standards we’ve set for ourselves.

Blue Sky DEF logo

1 Gallon DEF Fluid

Blue Sky DEF 1-gallon

Blue Sky DEF 32.5 is manufactured to ISO 22241 specifications and is an API Certified DEF 32.5% urea solution for use in passenger vehicles, trucks, construction and agricultural equipment. It is compatible with all Tier 4 final compliant equipment using Selective Catalytic Reduction (SCR) technology.

See our 32.5% Product Data Sheet and 32.5% Safety Data Sheet for more information on material compatibility and exposure instructions.

55 Gallon – Bulk DEF Fluid 

Blue SKy 55-gallon drum

2.5 Gallon DEF Fluid

Blue Sky DEF - 2.5 Gallon Premier Squat Jug

High quality diesel exhaust fluid that meets ISO 22241 standards and is API certified.

Stored and handling using ISO22241-1 guidelines. Date and batch code on each container. Packaged using DEF-dedicated equipment to eliminate the potential for cross- contamination.

  • Nonhazardous and nonflammable
  • Nontoxic *Premixed with pure water
  • Two-year shelf life

330 Gallon Bulk & Wholesale DEF Fluid

Blue Sky DEF - 275-330-gallon IBC totes