Diesel Exhaust Fluid Information
The Selective Catalytic Reduction (SCR) aftertreatment system for this engine requires Diesel Exhaust Fluid (DEF) to maintain exhaust emissions at levels compliant with emissions standards. DEF is a simple, non-toxic and inexpensive pre-mixed fluid composed of 2/3 pure water and 1/3 automotive grade urea. The following sections provide information regarding DEF availability, specifications, handling and storage, and certain SCR ani-tampering features.
Diesel Exhaust Fluid Availability
DEF is available in bulk quantities at roadside truck stop service centers. DEF is also available in various container sizes at Detroit™ service outlets, truck dealerships, and many truck service centers. DEF is available in container sizes as small as 2.5 gallons for convenient storage in your vehicle for emergency use.
Diesel Exhaust Fluid Specifications
DEF is manufactured to strict quality standards to ensure proper emissions control. Only DEF that meets DIN70700 or ISO 22241-1 specifications can be used. The American Petroleum Institute has developed a quality certification program to ensure the quality of DEF available at service outlets.
Diesel Exhaust Fluid Handling and Storage
When stored at temperatures between 10° and 90° F (minus 12° and 32° C), DEF has a maximum shelf life of 12 months. For best shelf life it is recommended that Diesel Exhaust Fluid (DEF) containers be stored in a controlled environment.
Diesel Exhaust Fluid System Anti-Tampering Feature
The diagnostic system monitors for faults in DEF system components and monitors the DEF supply pressure. If the diagnostics detect that components critical to the Selective Catalytic Reduction (SCR Catalyst) or DEF supply system are disconnected (which could indicate tampering), or if the diagnostics detect abnormal system pressures indicative of DEF supply blockage, the warning lamp will illuminate and the control system will initiate time and mileage counters. If the sensors detect that the SCR system has been tampered with, the MIL illuminates to warn the driver, and the engine performance is limited, with a 55 mph (90 km/h) speed limit. If the system fault is not corrected, the STOP engine light illuminates and a 5 mph (8 km/h) speed limit will be applied during non-driving conditions. Similar warnings and penalties will result when insufficient urea quantity is present.