Ram Trucks 2015 ProMaster Commercial - Diesel Supplement - Manual (Page 61)

For most year-round service, No. 2 diesel fuel meeting
ASTM (formerly known as the American Society for
Testing and Materials) specification D-975 Grade S15 will
provide good performance.
If the vehicle is exposed to extreme cold (below 20°F or
-7°C), or is required to operate at colder-than-normal
conditions for prolonged periods, use climatized No. 2
diesel fuel or dilute the No. 2 diesel fuel with 50% No. 1
diesel fuel. This will provide better protection from fuel
gelling or wax-plugging of the fuel filter.
WARNING!
Do not use alcohol or gasoline as a fuel blending
agent. They can be unstable under certain conditions
and hazardous or explosive when mixed with diesel
fuel.
Diesel fuel is seldom completely free of water. If water is
detected in the water separator while the engine is
running or while the ignition switch is in the ON/RUN
position, the “Generic Warning Light” will illuminate
and the specific message, “Service Fuel Filter” will ap-
pear in the Electronic Vehicle Information Center (EVIC).
If this occurs you should stop the engine and drain the
water from the filter housing.
NOTE:
Please see your authorized dealer for draining the
fuel/water separator and fuel filter replacement.
Purchasing good quality fuel and by following the cold
weather advice above, fuel conditioners should not be
required in your vehicle.
NOTE:
If available in your area, a high cetane “pre-
mium” diesel fuel may offer improved cold-starting and
warm-up performance.
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