2019 Wrangler User Manual

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TECHNICAL SPECIFICATIONS 531

FUEL REQUIREMENTS

2.0L Engine

This engine is designed to meet all emission

requirements, and provide satisfactory fuel

economy a

nd 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 91 or higher octane “premium” gasoline will

allow these engines to operate to optimal performance. This

increase in performance is most noticeable in hot weather or

other heavier load conditions, such as while towing.

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

ctane n

umber 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 considering

service for the vehicle.

3.6L Engine

This engine is designed to meet all emissions regula-

tions and provide satisfactory fuel economy and

performa

nce 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

” gasoline 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 gaso

line with an octane number lower than 87 can cause engine

ailure

and may void or not be covered by the New Vehicle

Limited Warranty.