What is DEF?
DEF is chemical grade urea in solution. Liquid at room temperature, it is composed of 32.5 percent urea and 67.5 percent deionised water.
What is the best DEF to use with a Perkins engine?
Operators can use any commercial DEF that meets the ISO 22241 specification in our SCR-equipped engines. They can buy it from a variety of retail locations, such as on-highway truck fuelling stations or automotive parts stores, or they can arrange for bulk delivery from fuel distributors or DEF producers.
What are the storage requirements for DEF?
Operators will need to consider several factors including the shelf-life, storage temperature and containment requirements of DEF when purchasing it.
The optimal storage temperature for DEF is 15-77 °F (-9- 25 °C). The rate of decay significantly accelerates when DEF is stored in temperatures above 90 °F /32 °C. It freezes at 12 °F/-11 °C.
Exposure to sunlight will reduce the shelf-life of your DEF.
DEF has specific container requirements, and there are restrictions around the kinds of containers that DEF can be stored in. If you’re unsure, please refer to the Perkins Operation and Maintenance Manual (OMM) for more information.
Operators will need to consider these materials when they transfer and handle DEF. If they pump DEF from bulk tanks, they should particularly consider the materials of the funnel and pump used.
Consult your OMM for specific instructions that relate to your engine system.
- With our SCR-equipped engines, operators will only need 3 litres of DEF for every 100 litres of diesel fuel
- Operators can use any DEF that meets the ISO 22241 specification in our SCR-equipped engines
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