Ram Trucks 2013 Chassis Cab - Diesel Supplement - Manual (Page 96)

Filling the DEF tank in cold climates
DEF will freeze below 12°F (-11°C); however, your ve-
hicle is equipped with an automatic preheating system
which allows the DEF system to operate below 12°F
(-11°C). When the vehicle is not in operation for an
extended period of time with temperatures at or below
12°F (-11°C), the DEF tank could freeze. If the tank is
OVERFILLED and freezes, it could be damaged, there-
fore DO NOT OVERFILL. To prevent overfilling of the
DEF tank if the EVIC indicates EXHAUST FLUID UN-
DER 1/2 FULL, you should only add a MAXIMUM of
2 gallons of DEF to the tank to prevent freeze damage
due to overfilling. If the EVIC indicates EXHAUST
FLUID LEVEL OK, do not add DEF.
DIESEL EXHAUST FLUID
Your vehicle is equipped with a Selective Catalytic Reduc-
tion system in order to meet the very stringent diesel
emissions standards required by the Environmental Pro-
tection Agency. Selective Catalytic Reduction (SCR) is the
first and only technology in decades to be as good for the
environment as it is good for business and vehicle perfor-
mance.
The purpose of the SCR system is to reduce levels of NOx
(oxides of nitrogen emitted from engines) that are harmful
to our health and the environment to an almost near-zero
level. Small quantities of Diesel Exhaust Fluid (DEF) are
injected into the exhaust upstream of a catalyst where,
when vaporized, convert smog-forming nitrogen oxides
(NOx) into harmless nitrogen (N2) and water vapor
(H2O), two natural components of the air we breathe. You
can operate with the comfort that your vehicle is contrib-
uting to a cleaner, healthier world environment for this
and generations to come.
94 STARTING AND OPERATING