Do Not Use E-85 In Non-Flex Fuel Vehicles; CNG And LP Fuel System Modifications; Methylcyclopentadienyl Manganese Tricarbonyl (MMT) In Gasoline- Page 485

2021 Jeep Gladiator Owner's Manual

Table of Contents

GETTING TO KNOW YOUR VEHICLE
GETTING TO KNOW YOUR INSTRUMENT PANEL
WARNING LIGHTS AND MESSAGES
STARTING AND OPERATING
MULTIMEDIA
SAFETY
OCCUPANT RESTRAINT SYSTEMS
SERVICING AND MAINTENANCE
VEHICLE MAINTENANCE
TECHNICAL SPECIFICATIONS
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TECHNICAL SPECIFICATIONS

483

D

O

 N

OT

 U

SE

 E-85 I

N

 N

ON

-F

LEX

 F

UEL

 

V

EHICLES

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 A

ND

 LP F

UEL

 S

YSTEM

 

M

ODIFICATIONS

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 

components. Problems that result from running 

CNG or LP are not the responsibility of the 

manufacturer and may void the New Vehicle 

Limited Warranty.

M

ETHYLCYCLOPENTADIENYL

 

M

ANGANESE

 T

RICARBONYL

 (MMT) I

N

 

G

ASOLINE

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. Gasoline 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 law and 

California reformulated gasoline.

9

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