Frequent Asked Questions (FAQ)

  1 What is DEF?
The non-toxic solution is based on 32.5% urea and 67.5% deionized water. Urea is a compound of nitrogen that turns to ammonia when heated. The fluid is known as AdBlue® in Europe/Asia and Diesel Exhaust Fluid (DEF) in North America.
  2 Why is DEF needed?
It is a reactant key to the selective catalytic reduction (SCR) process used in Tier 4 Final.
  3 Where is DEF available from?
The DEF solution can be ordered via the Volvo dealer network where it can either be collected or delivered directly to the job site.
  4 How is DEF packaged?
DEF is delivered in sealed, dedicated containers including cans and drums or in bulk to suit individual customer needs.
  5 What happens if you use a low-quality substitute instead of DEF?
Using low-quality substitutes could damage the after treatment system and result in reduced torque, speed and eventual machine shutdown. Unnecessary costs and downtime can easily be avoided by using the Volvo approved solution.
  6 How is the quality of DEF guaranteed?
The DEF solution has high purity requirements defined by ISO 22241-1. This ensures correct manufacturing, testing and handling procedures.
  7 Does low outside temperature affect DEF?
DEF freezes at 12°F. The SCR system heats the DEF tank and supply lines. If the fluid freezes when the machine is not in use, start-up and operation will not be affected. The SCR heating system will defrost the solution back to liquid form without affecting quality.
  8 How should DEF be stored and what is the shelf life of the solution?
DEF should be stored in a cool, dry and ventilated area away from direct sunlight. Recommended storage temperature is up to 77°F, although short term exposure to higher temperatures will not cause damage. If DEF is stored in the recommended way it will last for approximately two years.
  9 Why is it important to use equipment that is dedicated to DEF?
Dedicated DEF equipment must be used for dispensing and storing the solution to prevent contamination.
 10 Is DEF corrosive?
The non-toxic solution is corrosive to certain sensitive metals such as copper.
 11 What is DEF consumption?
Approximately between 5% and 7.5% of fuel consumption, depending on the machine type and application.