Your 2018 Jeep Grand Cherokee transmission fluid is not a one-size-fits-all product. It requires ZF 8 and 9 speed automatic transmission fluid, and checking the level correctly demands the transmission be at operating temperature. Using the wrong fluid can lead to shifting issues or expensive damage, so getting this right matters for your SUV’s longevity.
This guide covers everything you need to know about the 2018 Jeep Grand Cherokee transmission fluid. You will learn which fluid to buy, how to check the level, when to change it, and common mistakes to avoid. Let’s get started.
2018 Jeep Grand Cherokee Transmission Fluid
The 2018 Grand Cherokee uses a ZF-sourced 8-speed automatic transmission in most models. Some earlier 2018 builds might have the 9-speed, but the 8-speed is standard. Both transmissions require specific fluid formulations that are not the same as older ATF+4 fluids.
Your transmission is sealed and does not have a traditional dipstick on many models. This makes checking and changing the fluid a bit more involved than older vehicles. You will need to follow precise procedures to avoid overfilling or underfilling.
What Type Of Fluid Does A 2018 Jeep Grand Cherokee Use?
The 2018 Jeep Grand Cherokee transmission fluid is a synthetic lubricant designed for ZF transmissions. The exact specification is ZF LifeguardFluid 8 or Mopar 8 & 9 Speed ATF. These are fully synthetic fluids with specific friction modifiers.
Do not use Dexron, Mercon, or ATF+4 fluids. They will cause harsh shifting and eventual transmission failure. Always check your owner’s manual or the transmission tag for the exact fluid number.
- ZF LifeguardFluid 8 (part number S671090312)
- Mopar 8 & 9 Speed ATF (part number 68218925AB)
- Shell M-1375.4 (also compatible)
These fluids are dyed red or green depending on the batch. The color is not a reliable indicator of condition. Always buy from a trusted source to avoid counterfeit products.
How To Check The Transmission Fluid Level
Checking the 2018 Jeep Grand Cherokee transmission fluid level is not like a traditional dipstick check. Many models lack a dipstick entirely. Instead, you must check the fluid through a fill plug on the transmission pan.
Here is the step-by-step procedure for checking the fluid level correctly:
- Park the vehicle on a level surface. Engage the parking brake.
- Start the engine and let it idle until the transmission reaches operating temperature. This is typically around 85-95°C (185-203°F) for the transmission fluid.
- Shift through all gear positions (P, R, N, D) pausing for a few seconds in each. This circulates fluid through the valve body.
- Return the transmission to Park. Keep the engine running.
- Locate the fill plug on the side or bottom of the transmission pan. It is usually a hex or torx plug.
- Remove the fill plug carefully. Fluid should trickle out slowly. If no fluid comes out, the level is low.
- If fluid trickles out, let it drain until it stops. Reinstall the plug. If no fluid comes out, add fluid through the fill hole until it starts to drip, then reinstall the plug.
This process requires the transmission to be hot. Checking cold fluid will give a false reading. If you are not comfortable with this, have a professional do it.
When Should You Change The Transmission Fluid?
Jeep recommends checking the transmission fluid at regular intervals, but they do not specify a mandatory change interval for normal driving. However, severe service conditions require more frequent changes.
Severe service includes towing, off-road driving, frequent stop-and-go traffic, or driving in extreme temperatures. For these conditions, change the fluid every 40,000 to 60,000 miles.
For normal driving, many experts recommend changing the fluid around 60,000 to 80,000 miles. This helps maintain smooth shifting and extends transmission life. If you notice any of these signs, change the fluid sooner:
- Rough or delayed shifts
- Burning smell from the transmission
- Fluid that looks dark or smells burnt
- Transmission slipping or shuddering
Ignoring fluid changes can lead to internal wear and expensive repairs. The 2018 Jeep Grand Cherokee transmission fluid is not lifetime fluid, despite what some dealers say.
How To Change The Transmission Fluid
Changing the fluid on a 2018 Grand Cherokee requires some tools and care. You can do a drain and fill, or a full flush. A drain and fill replaces about 4-5 quarts, while a flush replaces all fluid.
Here is how to perform a drain and fill:
- Lift the vehicle safely on jack stands or a lift. Ensure it is level.
- Remove the transmission pan drain plug (if equipped) or the entire pan. Some models have a drain plug, others require pan removal.
- Drain the old fluid into a container. Dispose of it properly.
- If you removed the pan, clean it and replace the filter. The filter is often built into the pan on some models.
- Reinstall the pan with a new gasket or sealant. Torque the bolts to spec.
- Add new fluid through the fill hole. Start with about 4 quarts.
- Start the engine and let it idle. Shift through gears as described earlier.
- Check the fluid level with the engine running and transmission hot. Add fluid until it trickles from the fill hole.
- Reinstall the fill plug and test drive.
For a full flush, use a transmission fluid exchange machine. This is best done by a shop to avoid air bubbles or overpressure. Do not use a power flush if the transmission has high mileage or known issues.
Common Mistakes To Avoid
Many owners make mistakes when dealing with the 2018 Jeep Grand Cherokee transmission fluid. Here are the most common ones:
- Using the wrong fluid type. Always use ZF LifeguardFluid 8 or Mopar 8 & 9 Speed ATF.
- Checking the fluid when cold. The level will read low or high incorrectly.
- Overfilling the transmission. Too much fluid causes foaming and shifting problems.
- Not replacing the filter during a fluid change. The filter traps debris and should be changed.
- Ignoring leaks. Even small leaks can lead to low fluid and transmission damage.
Avoid these mistakes to keep your transmission healthy. If you are unsure, consult a mechanic who knows ZF transmissions.
Signs Of Low Or Bad Transmission Fluid
Your 2018 Grand Cherokee will show symptoms if the transmission fluid is low or degraded. Pay attention to these warning signs:
- Delayed engagement when shifting from Park to Drive or Reverse
- Hesitation or slipping during acceleration
- Rough or jerky shifts
- Whining or buzzing noises from the transmission
- Burning smell, especially after driving
- Transmission overheating warning light
If you notice any of these, check the fluid level and condition immediately. Low fluid can cause internal damage in a short time. Top off or change the fluid as needed.
Where To Buy Transmission Fluid
You can purchase the correct 2018 Jeep Grand Cherokee transmission fluid from several places. Always buy from reputable sellers to avoid counterfeit products.
- Jeep or Chrysler dealership parts department
- Online retailers like Amazon, RockAuto, or Summit Racing
- Auto parts stores like AutoZone, O’Reilly, or NAPA
- Specialty transmission shops
Prices vary, but expect to pay around $15 to $25 per quart. A drain and fill requires about 5 quarts, while a full flush needs 8-10 quarts. Buying in bulk can save money.
Can You Mix Different Brands Of Transmission Fluid?
It is not recommended to mix different brands of transmission fluid, even if they claim to meet the same specification. Different additive packages can react and cause issues.
Stick with one brand for the life of the fluid. If you need to top off, use the same fluid that is already in the transmission. If you do not know what is in there, do a full fluid change instead of mixing.
Transmission Fluid Capacity
The 2018 Jeep Grand Cherokee transmission fluid capacity depends on the model and transmission type. Here are approximate capacities:
- 8-speed automatic (ZF 8HP): Approximately 8.5 quarts for a dry fill, 4-5 quarts for a drain and fill
- 9-speed automatic (ZF 9HP): Approximately 9 quarts for a dry fill, 5-6 quarts for a drain and fill
Always check your specific vehicle. The capacity can vary slightly based on the transmission pan design and whether it has a filter. Use the fill level procedure to get the exact amount.
Does The 2018 Grand Cherokee Have A Transmission Dipstick?
Most 2018 Jeep Grand Cherokee models do not have a transmission dipstick. The transmission is considered sealed and requires checking through the fill plug. Some earlier models or specific trims might have a dipstick, but it is rare.
If your vehicle has a dipstick, use it to check the fluid level with the engine running and transmission hot. The dipstick will have markings for hot and cold levels. Follow the same warm-up procedure described earlier.
What Happens If You Use The Wrong Fluid?
Using the wrong fluid in your 2018 Jeep Grand Cherokee transmission can cause serious problems. The wrong viscosity or friction modifiers can lead to:
- Harsh or delayed shifts
- Transmission slipping
- Overheating
- Premature wear of clutches and seals
- Complete transmission failure
If you accidentally add the wrong fluid, drain it immediately and refill with the correct fluid. Do not drive the vehicle until the fluid is corrected. Continuing to drive can cause irreversible damage.
How To Reset The Transmission Adaptive Learning
After changing the 2018 Jeep Grand Cherokee transmission fluid, you may need to reset the transmission adaptive learning. This clears old shift patterns and allows the transmission to relearn with the new fluid.
Here is how to reset the adaptive learning on most models:
- Turn the ignition to the ON position without starting the engine.
- Press the accelerator pedal to the floor and hold it for 10-15 seconds.
- Turn the ignition OFF while still holding the pedal.
- Release the pedal and wait 2 minutes.
- Start the engine and drive normally. The transmission will relearn shift patterns over the next 50-100 miles.
Some models may require a scan tool to reset the adaptive values. If the procedure does not work, visit a dealer or transmission shop.
Frequently Asked Questions
Can I use ATF+4 in my 2018 Jeep Grand Cherokee?
No. ATF+4 is not compatible with the ZF 8 or 9 speed transmissions. Using it will cause damage. Only use ZF LifeguardFluid 8 or Mopar 8 & 9 Speed ATF.
How often should I check the transmission fluid level?
Check the fluid level every 30,000 miles or once a year. If you tow or drive off-road, check it more often. Low fluid can cause problems quickly.
Is the transmission fluid lifetime fluid?
No. Jeep does not call it lifetime fluid. It degrades over time and should be changed every 60,000 to 80,000 miles for normal driving, or sooner for severe conditions.
Can I change the transmission fluid myself?
Yes, if you have basic mechanical skills and tools. The process is straightforward but requires care to avoid overfilling or using the wrong fluid. Follow the procedure exactly.
What is the cost to change the transmission fluid at a shop?
Expect to pay $200 to $400 for a drain and fill at a shop. A full flush can cost $300 to $500. DIY costs about $75 to $125 for fluid and a filter.
Taking care of your 2018 Jeep Grand Cherokee transmission fluid is one of the best ways to keep your SUV running smoothly. Use the right fluid, check it correctly, and change it on schedule. Your transmission will thank you with years of reliable service.