Do Not Use E-85 In Non-Flex Fuel Vehicles; CNG And LP Fuel System Modifications; MMT In Gasoline- Page 436

2018 Jeep Wrangler JK Owner Manual

Table of Contents

GETTING TO KNOW YOUR VEHICLE
GETTING TO KNOW YOUR INSTRUMENT PANEL
SAFETY
OCCUPANT RESTRAINT SYSTEMS
STARTING AND OPERATING
SERVICING AND MAINTENANCE
MULTIMEDIA
UCONNECT PHONE — IF EQUIPPED
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Do Not Use E-85 In Non-Flex Fuel Vehicles

Non-Flex Fuel Vehicles (FFV) are compatible with gasoline

containing up to 15% ethanol (E-15). Use of gasoline with

higher ethanol content may void the New Vehicle Limited

Warranty.
If a Non-FFV vehicle is inadvertently fueled with E-85 fuel,

the engine will have some or all of these symptoms:

Operate in a lean mode.

OBD II “Malfunction Indicator Light” on.

Poor engine performance.

Poor cold start and cold drivability.

Increased risk for fuel system component corrosion.

CNG And LP Fuel System Modifications

Modifications that allow the engine to run on compressed

natural gas (CNG) or liquid propane (LP) may result in

damage to the engine, emissions, and fuel system compo-

nents. Problems that result from running CNG or LP are

not the responsibility of the manufacturer and may void or

not be covered under the New Vehicle Limited Warranty.

MMT In Gasoline

Methylcyclopentadienyl Manganese Tricarbonyl (MMT) is

a manganese-containing metallic additive that is blended

into some gasoline to increase octane. Gasoline blended

with MMT provides no performance advantage beyond

gasoline of the same octane number without MMT. Gaso-

line blended with MMT reduces spark plug life and

reduces emissions system performance in some vehicles.

The manufacturer recommends that gasoline without

MMT be used in your vehicle. The MMT content of

gasoline may not be indicated on the gasoline pump;

therefore, you should ask your gasoline retailer whether

the gasoline contains MMT. MMT is prohibited in Federal

and California reformulated gasoline.

Fuel System Cautions

CAUTION!

Follow these guidelines to maintain your vehicle’s
performance:

The use of leaded gasoline is prohibited by Federal
law. Using leaded gasoline can impair engine perfor-
mance and damage the emissions control system.

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TECHNICAL SPECIFICATIONS

Detailed Information for 2018 Jeep Wrangler JK Owner Manual

Lists of information found in 2018 Jeep Wrangler JK Owner Manual - Page 436

  • Operate in a lean mode.
  • OBD II “Malfunction Indicator Light” on.
  • Poor engine performance.
  • Poor cold start and cold drivability.
  • Increased risk for fuel system component corrosion.
  • The use of leaded gasoline is prohibited by Federal law.

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