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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 in these engines.
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
contains a higher level
of detergents to further
aide in minimizing en-
gine and fuel system
deposits. When avail-
able, 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 perfor-
mance. 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 die-
sel 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.
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