Adding Diesel Exhaust Fluid
The DEF gauge (located in the instrument cluster) will display the level of DEF
remaining in the tank.
Completely fill the DEF tank through the diesel exhaust fluid fill location at every
maintenance interval or before if prompted by the Electronic Vehicle Information
Center (EVIC)/Driver Information Display (DID).
The DEF tank on these vehicles is designed with a large amount of full reserve. So the
level sensor will indicate a full reading even before the tank is completely full. To put
it another way, there’s additional storage capacity in the tank above the Full mark
that’s not represented in the gauge. You may not see any movement in the reading –
even after driving up to 2,000 miles in some cases.
NOTE:
• Driving conditions (altitude, vehicle speed, load, etc.) will effect the amount of
DEF that is used in your vehicle.
• Another factor is that outside temperature can affect DEF consumption. In cold
conditions, 12° F (-11° C) and below, the DEF gauge needle can stay on a fixed
position and may not move for extended periods of time. This is a normal function
of the system.
• Since DEF will begin to freeze at 12°F (-11°C), your vehicle is equipped with an
automatic DEF heating system. This allows the DEF injection system to operate
properly at temperatures below 12°F (-11°C). If your vehicle is not in operation for
an extended period of time with temperatures below 12°F (-11°C), the DEF in the
tank may freeze. If the tank is overfilled and freezes, it could be damaged.
Therefore, do not overfill the DEF tank. Extra care should be taken when filling
with portable containers to avoid overfilling. Note the level of the DEF gauge in
your instrument cluster. On pickup applications, you may safely add a maximum
of 2 gallons (7.5 liters) of DEF from portable containers when your DEF gauge is
reading ½ full. On Chassis Cab applications a maximum of 2 gallons (7.5 liters)
may be added when the DEF gauge is reading ¾ full.
• There is an electric heater inside the DEF tank that automatically works when
necessary. And if the DEF supply does freeze, the truck will operate normally until
it thaws.
• Ensure the DEF cap is reinstalled prior to filling vehicle with diesel fuel to avoid
spilling diesel fuel into the DEF Filler.
6 . 7 L C U M M I N S D I E S E L
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Summary of Contents for Chassis CAB 4500 2016
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