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Keep a record for at least one month and record the type of driving (city
or highway). This provides an accurate estimate of your vehicle's fuel
economy under current driving conditions. Additionally, keeping records
during summer and winter shows how temperature impacts fuel
economy. In general, lower temperatures mean lower fuel economy.
SELECTIVE CATALYTIC REDUCTION (SCR) SYSTEM (DIESEL
ENGINE ONLY)
Your vehicle is equipped with a selective catalytic reduction (SCR)
system to help reduce emission levels of oxides of nitrogen from the
exhaust of the diesel engine. The system automatically injects diesel
exhaust fluid (DEF) into the exhaust system to enable proper SCR
function.
Importance of Maintaining the DEF Level
In order for the SCR system to operate properly, you must maintain the
DEF level. Generally, you should fill the DEF tank before the DEF gauge
in the instrument cluster reaches the first low level warning (see
Warning messages and vehicle operations).
The engine control unit monitors the amount of fluid available in the
DEF tank. Failure to maintain an adequate amount of DEF in the system
generates warning messages that appear in the information display and,
unless you refill the DEF tank, leads to a forced reduction of engine
operations.
Warning Messages and Vehicle Operations
The instrument cluster contains a DEF gauge and indicator lights to alert
you to any low DEF level conditions. The indicator lights illuminate if the
DEF gauge level drops below 1 gallon (3.8 liters) in the 5-gallon
(19.0 liters) DEF tank or 2 gallons (7.6 liters) in the 10-gallon
(34.0 liters) DEF tank.
Upon filling the DEF tank after a low-level warning, normal operation
resumes when you restart your vehicle.
2015 F-650/750 (f67)
Owners Guide gf (ownloose), 1st Printing, December 2013
Canadian_French (fr_can)
Fuel and Refueling
I n f o r ma t i o n P r o v i d e d b y :
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