Materials Added To Fuel; Fuel Requirements - Diesel Engine - Jeep grand cherokee 2017 User Manual

"Premium" gasoline having a posted octane
number of 91 as specified by the (R+M)/
2 method. The use of 91 or higher octane
"Premium" gasoline is required for in this
engine.
While operating on gasoline with the required
octane number, hearing a light knocking
sound from the engine is not a cause for
concern. However, if the engine is heard
making a heavy knocking sound, see your
dealer immediately. Use of gasoline with a
lower than recommended octane number can
cause engine failure and may void or not be
covered by the New Vehicle Limited Warranty.
Poor quality gasoline can cause problems
such as hard starting, stalling, and hesita-
tions. If you experience these symptoms, try
another brand of gasoline before considering
service for the vehicle.

Materials Added To Fuel

Designated TOP TIER
Detergent Gasoline con-
tains a higher level of de-
tergents to further aide
in minimizing engine
and fuel system deposits. When available,
the usage of Top Tier Detergent gasoline is
recommended. Visit www.toptiergas.com for a
list of TOP TIER Detergent Gasoline Retailers.
Indiscriminate use of fuel system cleaning
agents should be avoided. Many of these
materials intended for gum and varnish re-
moval may contain active solvents or similar
ingredients. These can harm fuel system gas-
ket and diaphragm materials.
FUEL REQUIREMENTS –
DIESEL ENGINE
Federal law requires that you must fuel this
vehicle with Ultra Low Sulfur Highway Diesel
fuel (15 ppm Sulfur maximum) and prohibits
the use of Low Sulfur Highway Diesel fuel
(500 ppm Sulfur maximum) to avoid damage
to the emissions control system.
Use good quality diesel fuel from a reputable
supplier in your vehicle. 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 filters.
WARNING!
Do not use alcohol or gasoline as a fuel
blending agent. They can be unstable un-
der certain conditions and hazardous or
explosive when mixed with diesel fuel.
Diesel fuel is seldom completely free of
water. To prevent fuel system trouble, drain
the accumulated water from the fuel/water
separator using the fuel/water separator drain
provided on the fuel filter housing. If you buy
good quality fuel and follow the cold weather
advice above, fuel conditioners should not
be required in your vehicle. If available in
your area, a high cetane "premium" diesel
fuel may offer improved cold-starting and
warm-up performance.
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