Jeep Gladiator Gas Type

The Gladiator is a legendary Jeep truck having incredible open-air freedom. It was first introduced in 1962 and discontinued in 1971. And now, Jeep Gladiator is being reintroduced to the market.

Here we discuss the Jeep Gladiator gas type. Short answere

Jeep Gladiator recommends regular unleaded gasoline with an 87 octane rating for a 3.6-liter V6 engine and 3.0-liter turbodiesel engine using diesel fuel No. 2.

Jeep Gladiator Gas Type – JT (2020-2023)

EngineGas Type
3.6L V6Regular Gasoline 87
3.0L dieselDiesel Fuel No. 2

Gasoline Recommendations (Can and Can’t Use)

Reformulated Gasoline

Reformulated gasoline (RFG) is a cleaner-burning fuel. It can lower emissions of highly volatile organic compounds.

In many areas in the US RFG is required.

Therefore Jeep Gladiator strongly guides using reformulated gasoline.

Gasoline/Oxygenate Blends

Jeep Gladiator suggests using gasoline containing up to 15% ethanol (E-15).

Do not use methanol blended gasoline.

Do Not Use E-85 In Non-Flex Fuel Vehicles

Jeep Gladiator is not a flex-fuel vehicle. Using Flex-fuel or E-85 in it will render problems such as

  1. lean mode
  2. inadequate engine performance
  3. difficult to start and drive in cold weather
  4. corrosion may increase.

MMT In Gasoline

MMT is an octane enhancer.

There is no advantage to using MMT blended gasoline, else can damage the spark plug and deposit manganese particles on the engine.

The emission of manganese particles is harmful to the environment, therefore it is prohibited in federal and California.

Don’t use gasoline with MMT in Jeep Gladiator.

Materials Added To Fuel

Using TOP-TIER Detergent Gasoline can help to improve gas mileage, maintains engine performance, and lower emissions.

Fuel system clean agents can harm the fuel system gasket. So, don’t use it.

Flexible Fuel (E-85)

E-85 signifies 15% unleaded gasoline and up to 85% ethanol.

The Jeep Gladiator has two engines, 3.6L, and 3.0L. Both engines lack flex fuel abilities.

Diesel fuel

If your Gladiator with a 3.0L diesel engine, federal law requires you to fuel Gladiator with ultra-low sulfur diesel fuel grade S15 (15 ppm Sulfur maximum). And prohibit low-sulfur diesel fuel grade S500 (500 ppm Sulfur maximum).

The number 2 diesel fuel grade S15 is fine in hot and ordinary temperatures. For cold temperatures (below -7°C), use climatized or dilute the Number 2 diesel fuel with 50% Number 1 diesel fuel. Number 1 diesel fuel, grade S15, should only be used where ample icy conditions exist (-23 °C).


Biodiesel is fuel that are produce from animal fat, rapeseed oil (Rapeseed Methyl Ester base), or soybean oil (Soy Methyl Ester base).

Jeep recommend to use upto 5% biodiesel. The biodiesel B6 to B20 or higher cause premature engine wear.

Frequently Asked Questions (FAQs)

What octane should I use in Jeep Gladiator?

The engine in the vehicle decides the gas type. The Jeep Gladiator comes with a 3.6-liter V6 engine. For a 3.6L engine, regular gasoline 87-octane is recommended.

Is the Jeep Gladiator petrol or diesel?

Jeep gladiator in both petrol and diesel engines. The 3.6-liter petrol engine and 3.0-liter diesel engine.

Are Jeep gladiators good on gas?

Jeep Gladiator gas mileage:
3.6L engine – EPA-estimated 16 mpg in the city and 23 mpg on the highway
3.0L engine – EPA-estimated 22 mpg in the city and 28 mpg on the highway

Conclusion – Jeep Gladiator gas type

Jeep Gladiator is a compact truck outfitted with a 3.0l and 3.6l engine.

The 3.6l engine Gladiator intake is regular gasoline (87-octane). And the 3.0l engine uses diesel fuel.

To improve performance, use the gas type recommended by Jeep Gladiator.


2023 Jeep Gladiator owner’s manual

2022 Jeep Gladiator owner’s manual

2021 Jeep Gladiator owner’s manual

2020 Jeep Gladiator owner’s manual

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