WARNING
Do not put diesel fuel in the aftertreatment DEF tank. Diesel fuel, if sprayed into the hot exhaust along with the DEF, could
ignite explosively causing a fire resulting in personal injury or damage to the exhaust system.
W3036787
Diesel Exhaust Fluid (DEF)
DEF is a reactant that's key to the SCR process. It's a nontoxic, ultra-pure solution of urea and ultra-pure water. Urea is a
compound of nitrogen that turns to ammonia when heated. The fluid is non flammable, and is not dangerous when handled
as recommended. However, it is highly corrosive to certain metals, especially copper and brass. Read the separate section
concerning the handling of DEF solution. Use only
DEF
that is
clearly labeled as meeting ISO-22241
standards, and
certi-
fied by the American Petroleum Institute (API).
The container
must display the API certification seal. Never use agri-
cultural or industrial grade urea.
Use of fluids other than API certified DEF will compromise aftertreatment system
performance, increase emissions, and may impact your product warranties.
Never dilute DEF with water or any other flu-
id.
It is recommended that DEF not be stored in extreme hot or cold conditions, or for prolonged periods. Follow the instruc-
tions for proper storage and handling as indicated on the container or provided with the purchase.
Note:
Agriculture mixtures are not pure enough for use in the SCR system and impurities in the solution will comprise the
SCR system.
Notes
Mack Body Builder Instructions
CHU, CXU, GU, TD, MRU, LR
USA139046859
Date 5.2017
Body Builder; Engine, MP7, MP8, and MP10
Page 18 (43)
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