Fuel Requirements; 6.2L Supercharged And 6.4L Engine; Methanol; Ethanol - Jeep Grand Cherokee SRT 2019 Owner's Manual

Torque Patterns
WARNING!
To avoid the risk of forcing the vehicle off the
jack, do not tighten the lug nuts/bolts fully
until the vehicle has been lowered. Failure to
follow this warning may result in personal
injury.

FUEL REQUIREMENTS

6.2L Supercharged And 6.4L Engine

Do not use E-85 flex fuel or ethanol blends
greater than 15% in this engine.
Your vehicle is designed to operate using high-
quality unleaded gasoline having a Research
Octane Number (RON) of 95 or higher. The
manufacturer recommends the use of 98 Re-
search Octane Number for optimum perfor-
mance.
Light spark knock at low engine speeds is not
harmful to your engine. However, continued
heavy spark knock at high speeds can cause
damage and immediate service is required.
Poor quality gasoline can cause problems such
as hard starting, stalling, and hesitations. If you
experience these symptoms, try another brand
of gasoline before considering service for the
vehicle.

Methanol

(Methyl) is used in a variety of concentrations
when blended with unleaded gasoline. You may
find fuels containing 3% or more methanol along
with other alcohols called cosolvents. Problems
that result from using methanol/gasoline are not
the responsibility of the manufacturer. While
MTBE is an oxygenate made from Methanol, it
does not have the negative effects of Methanol.
WARNING!
Do not use gasolines containing Methanol.
Use of these blends may result in starting
and drivability problems and may damage
critical fuel system components.

Ethanol

The manufacturer recommends that your ve-
hicle be operated on fuel containing no more
than 15% ethanol. Purchasing your fuel from a
reputable supplier may reduce the risk of ex-
ceeding this 15% limit and/or of receiving fuel
with abnormal properties. It should also be
noted that an increase in fuel consumption
should be expected when using ethanol-
blended fuels, due to the lower energy content
of ethanol. Problems that result from using
methanol/gasoline or E-85 ethanol blends are
not the responsibility of the manufacturer.
CAUTION!
Use of fuel with Ethanol content higher than
15% may result in engine malfunction, start-
ing and operating difficulties, and materials
degradation. These adverse effects could
result in permanent damage to your vehicle.

Clean Air Gasoline

Many gasolines are now being blended to con-
tribute to cleaner air, especially in those areas
where air pollution levels are high. These new
blends provide a cleaner burning fuel and some
are referred to as "reformulated gasoline."
The manufacturer supports these efforts toward
cleaner air. You can help by using these blends
as they become available.
CNG And LP Fuel System
Modifications
Modifications that allow the engine to run on
Compressed Natural Gas (CNG) or Liquid Pro-
pane (LP) may result in damage to the engine,
emissions, and fuel system components. Prob-
lems that result from running CNG or LP are not
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