Fuel Requirements; 2.0L Engine - Jeep Wrangler2018 Owner's Manual

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

FUEL REQUIREMENTS

2.0L Engine

This engine is designed to meet all emis-
sion regulations, and provide satisfac-
tory fuel economy and performance
when using high-quality unleaded
"Regular" gasoline having a posted oc-
tane number of 87 as specified by the
(R+M)/2 method. For optimal perfor-
mance the use of 91 or higher octane "Premium" gasoline
is recommended 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 immedi-
ately. 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 hesitations. If you experience these
symptoms, try another brand of gasoline before consider-
ing service for the vehicle.
3.6L Engine
This engine is designed to meet all emis-
sions regulations and provide excellent
fuel economy and performance when
using high-quality unleaded "Regular"
gasoline having an octane rating of 87 as
specified by the (R+M)/2 method. The
use of higher octane "Premium" gaso-
line will not provide any benefit over "Regular" gasoline in
these engines.
While operating on gasoline with an octane number of 87,
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 an octane number lower than 87 can cause
engine failure and may void or not be covered by the New
Vehicle Limited Warranty.