The diesel exhaust fluid (DEF) system is part of the emission system for this vehicle, and
must be serviced while observing extreme care to prevent foreign contamination of any kind
from entering this system. If extreme care is NOT taken to prevent contamination from dirt,
debris, fluids other than DEF, etc., reduced performance and/or damage to the DEF system
may result.
Cleanliness of the diesel exhaust fluid (DEF) system is crucial to ensure proper operation.
Before opening any part of the DEF system, ensure connections and joints are thoroughly
clean and dry of any dirt, debris, or other contaminants. Use only low pressure water and
low pressure air, as directed.
Diesel exhaust fluid (DEF) will have a tendency over time to develop areas of dried
crystallization residue. Crystallization residue is a normal process for this fluid. Dried DEF
crystallization residue can be wiped away, or flushed away with clean water, depending on
location of the crystallization.