Your Jeep Grand Cherokee runs best on regular unleaded gasoline with an octane rating of 87. But if you’re wondering what kind of gas does a Jeep Grand Cherokee take, the answer depends on your specific engine and model year. Most Grand Cherokees are designed to run perfectly fine on 87 octane, but there are some exceptions, especially for high-performance trims.
Using the right fuel keeps your engine running smoothly and prevents knocking or pinging. It also helps you avoid costly repairs down the road. Let’s break down exactly what fuel you need for your Jeep Grand Cherokee.
What Kind Of Gas Does A Jeep Grand Cherokee Take
The short answer is regular unleaded gasoline with an octane rating of 87. This applies to the majority of Jeep Grand Cherokee models, including those with the 3.6L Pentastar V6 engine and the 5.7L HEMI V8. However, there are a few important exceptions.
If you drive a Grand Cherokee with the 6.4L HEMI V8 engine, like the SRT or Trackhawk models, you should use premium unleaded gasoline with an octane rating of 91 or higher. These high-performance engines are tuned for higher octane fuel to prevent detonation and maximize power output.
Understanding Octane Ratings
Octane rating measures a fuel’s ability to resist knocking or pinging during combustion. Higher octane fuel can withstand more compression before igniting. This is important for high-performance engines that run at higher compression ratios.
For most Grand Cherokees, 87 octane is perfectly safe. Using a higher octane than recommended won’t give you any extra power or fuel economy. It’s just a waste of money.
What Happens If You Use The Wrong Gas
Using a lower octane than recommended can cause engine knocking, which sounds like a metallic pinging noise. This can lead to engine damage over time. On the other hand, using a higher octane than needed is harmless but pointless.
If you accidentally put premium gas in a Grand Cherokee that requires regular, don’t worry. It won’t hurt anything. Your engine will just run a bit richer, and you’ll waste money.
Fuel Requirements By Engine Type
Let’s look at each engine option for the Jeep Grand Cherokee and what fuel they need.
3.6L Pentastar V6 Engine
- Recommended fuel: Regular unleaded (87 octane)
- Minimum octane: 87
- Premium fuel: Not required, but won’t hurt
This is the most common engine in Grand Cherokees. It’s designed for regular gas. Using premium won’t give you any benefits.
5.7L HEMI V8 Engine
- Recommended fuel: Regular unleaded (87 octane)
- Minimum octane: 87
- Premium fuel: Optional for towing or high-load conditions
The 5.7L HEMI can run on regular gas, but some owners report better performance with premium when towing heavy loads. Check your owner’s manual for specific recommendations.
6.4L HEMI V8 Engine (SRT And Trackhawk)
- Recommended fuel: Premium unleaded (91 octane or higher)
- Minimum octane: 91
- Regular fuel: Not recommended, can cause knocking
These high-performance engines require premium fuel. Using regular gas can cause engine damage and reduce power output. Always use 91 octane or higher.
4Xe Plug-In Hybrid Engine
- Recommended fuel: Regular unleaded (87 octane)
- Minimum octane: 87
- Electric range: Up to 25 miles on battery alone
The 4xe hybrid model runs on regular gas. It also has an electric motor that can power the vehicle for short distances. You’ll save money on fuel if you charge it regularly.
Diesel Engine Options
Some older Grand Cherokee models came with a diesel engine. If you have a diesel Grand Cherokee, you need diesel fuel, not gasoline. Never put gasoline in a diesel engine, or vice versa.
Diesel engines require diesel fuel with the proper cetane rating. Check your owner’s manual for specific recommendations. Using the wrong fuel can cause serious engine damage.
What About E85 Or Flex Fuel
Most Jeep Grand Cherokees are not flex-fuel vehicles. They cannot run on E85 (85% ethanol). Using E85 in a non-flex-fuel vehicle can damage the fuel system and engine.
If your Grand Cherokee is flex-fuel capable, it will have a yellow gas cap or a badge on the rear. Only use E85 if your vehicle is specifically designed for it.
How To Check Your Grand Cherokee’s Fuel Requirements
If you’re still unsure what gas to use, here’s how to find out.
- Check the fuel filler door. Many Grand Cherokees have a sticker inside the fuel door that lists the recommended octane.
- Look in your owner’s manual. The fuel requirements are listed in the specifications section.
- Check the engine oil cap. Some models have the octane rating printed on the oil cap.
- Call your local Jeep dealer. They can tell you exactly what fuel your specific model needs.
If you can’t find the information, err on the side of caution and use 87 octane regular gas. Most Grand Cherokees are designed for it.
Common Myths About Gasoline For Jeeps
There are a lot of misconceptions about what fuel your Jeep needs. Let’s clear them up.
Myth 1: Premium Gas Gives You More Power
False. Unless your engine is designed for premium gas, using it won’t increase horsepower. Your engine’s computer adjusts timing based on the fuel you use. With premium, it may advance timing slightly, but the gains are minimal.
Myth 2: Premium Gas Cleans Your Engine Better
All gasoline sold in the US contains detergents that clean your engine. Premium gas doesn’t necessarily have more detergents than regular. Look for “Top Tier” gasoline if you want extra cleaning agents.
Myth 3: You Should Always Use The Highest Octane Available
No. Using a higher octane than your engine needs is a waste of money. Your engine won’t run better or last longer. Stick with the recommended octane.
What To Do If You Put The Wrong Gas In Your Jeep
Mistakes happen. If you put the wrong fuel in your Grand Cherokee, here’s what to do.
If You Put Premium In A Regular-Required Engine
Nothing. It’s harmless. Just drive normally. Your engine will adjust automatically. You might notice slightly better performance, but it’s not worth the extra cost.
If You Put Regular In A Premium-Required Engine
This can cause knocking, especially under load. If you only put a small amount, top off with premium to dilute it. If you filled the tank, consider having it drained. Drive gently until the fuel is used up.
If You Put Diesel In A Gasoline Engine
Do not start the engine. Call a tow truck and have the fuel system drained. Diesel in a gasoline engine can cause serious damage. This is a costly mistake.
If You Put Gasoline In A Diesel Engine
Same as above. Do not start the engine. Have the fuel system drained immediately. Gasoline in a diesel engine can destroy the fuel pump and injectors.
Fuel Economy Tips For Your Grand Cherokee
Using the right gas is just one part of keeping your Jeep efficient. Here are some tips to improve fuel economy.
- Keep your tires properly inflated. Under-inflated tires increase rolling resistance.
- Drive smoothly. Avoid rapid acceleration and hard braking.
- Remove excess weight. Don’t carry things you don’t need.
- Use cruise control on highways. It maintains a constant speed.
- Service your engine regularly. Clean air filters and fresh oil help.
These small changes can add up to significant savings over time.
Frequently Asked Questions
Can I Use 89 Octane Gas In My Jeep Grand Cherokee?
Yes, you can use 89 octane if you want. It won’t hurt anything, but it’s not necessary. Your engine is designed for 87 octane. Using 89 is just a waste of money.
Does The Jeep Grand Cherokee Trackhawk Require Premium Gas?
Yes, the Trackhawk with the 6.4L HEMI V8 requires premium fuel with an octane rating of 91 or higher. Using regular gas can cause engine knocking and reduce performance.
What Kind Of Gas Does A 2023 Jeep Grand Cherokee Take?
The 2023 Grand Cherokee with the 3.6L V6 takes regular unleaded (87 octane). The 4xe hybrid also takes regular gas. The high-performance models require premium.
Can I Use E15 (15% Ethanol) In My Grand Cherokee?
Most Grand Cherokees can run on E15, but check your owner’s manual. E15 is approved for vehicles from 2001 and newer. Avoid E85 unless your vehicle is flex-fuel capable.
What Happens If I Use 87 Octane In A Grand Cherokee SRT?
Using 87 octane in an SRT can cause engine knocking, reduced power, and potential damage over time. Always use 91 octane or higher for SRT and Trackhawk models.
Final Thoughts On Fuel For Your Jeep Grand Cherokee
Knowing what kind of gas your Jeep Grand Cherokee takes is simple for most owners. Stick with regular unleaded 87 octane for the standard V6 and V8 engines. If you have a high-performance model like the SRT or Trackhawk, use premium fuel. For diesel models, use diesel fuel only.
Always check your owner’s manual for the most accurate information. Using the right fuel keeps your engine healthy and saves you money. Don’t fall for myths about premium gas being better for all cars. It’s not.
If you’re ever in doubt, use regular 87 octane. It’s the safest choice for the vast majority of Grand Cherokees. And remember, a well-maintained engine with the right fuel will serve you for many miles to come.