2018 Jeep Grand Cherokee Oil Capacity – Master Your Next Oil Change

Every seasoned off-roader and diligent DIY mechanic knows that proper vehicle maintenance isn’t just a recommendation—it’s the backbone of reliability, especially when you’re far from the paved road. Neglecting your engine’s lifeblood, the motor oil, can lead to costly repairs and leave you stranded. If you own one of these capable SUVs, understanding the exact 2018 Jeep Grand Cherokee oil capacity is paramount for keeping your engine running strong.

You’re likely here because you want to get your hands dirty, save some cash, and ensure your Grand Cherokee gets the best care possible. We agree that taking control of your vehicle’s maintenance is a smart move. In this comprehensive guide, we promise to equip you with all the expert knowledge needed for a flawless oil change, from identifying the correct oil capacity for your specific engine to choosing the right oil type and executing the change safely and efficiently. You’ll learn the precise specifications, the tools you’ll need, and a step-by-step process that even a weekend warrior can master, ensuring your 2018 Grand Cherokee is always trail-ready.

Let’s dive in and make sure your Jeep’s heart is perfectly lubricated and protected.

Table of Contents

Understanding Your 2018 Jeep Grand Cherokee Oil Capacity by Engine Type

The 2018 Jeep Grand Cherokee was offered with several robust engine options, each requiring a specific amount of engine oil. Knowing your particular engine is the first step in determining the correct oil capacity. This isn’t a one-size-fits-all situation; using the wrong amount can lead to engine damage or reduced performance.

Always double-check your owner’s manual for the most accurate and up-to-date information for your specific vehicle configuration. However, here’s a detailed breakdown of the typical 2018 Jeep Grand Cherokee oil capacity based on its engine.

3.6L Pentastar V6 Engine Oil Capacity

The 3.6L Pentastar V6 is a very popular engine in many Jeep and Chrysler vehicles, known for its balance of power and efficiency. If your 2018 Grand Cherokee is equipped with this engine, you’ll need a specific amount of oil.

Oil Capacity: 6 quarts (5.7 liters) with a new oil filter.
Recommended Oil Type: Mopar recommends SAE 5W-20 API Certified engine oil.
Specification: Look for oil meeting Chrysler Material Standard MS-6395.

Using the correct viscosity and specification is crucial for optimal engine lubrication and longevity. This engine runs best on the specified blend.

5.7L HEMI V8 Engine Oil Capacity

For those who crave more power, the 5.7L HEMI V8 engine delivers impressive performance. This larger engine naturally requires a different oil capacity to function correctly.

Oil Capacity: 7 quarts (6.6 liters) with a new oil filter.
Recommended Oil Type: Mopar recommends SAE 5W-20 API Certified engine oil.
Specification: Ensure the oil meets Chrysler Material Standard MS-6395.

The HEMI’s robust design benefits greatly from consistent lubrication with the right type and amount of oil. Don’t skimp on quality here.

6.4L SRT HEMI V8 Engine Oil Capacity

The high-performance SRT models of the 2018 Grand Cherokee feature the potent 6.4L HEMI V8. This engine is designed for extreme power and requires specific care.

Oil Capacity: 7 quarts (6.6 liters) with a new oil filter.
Recommended Oil Type: Mopar recommends SAE 0W-40 API Certified synthetic engine oil.
Specification: This engine specifically requires oil meeting Chrysler Material Standard MS-12633.

The SRT’s demanding performance profile makes the use of full synthetic 0W-40 oil absolutely essential. Do not substitute this with conventional or a different viscosity.

3.0L EcoDiesel V6 Engine Oil Capacity

The 3.0L EcoDiesel V6 offers excellent torque and fuel economy, a popular choice for towing and long-distance travel. Diesel engines have unique lubrication requirements.

Oil Capacity: 8.5 quarts (8.0 liters) with a new oil filter.
Recommended Oil Type: Mopar recommends SAE 5W-30 low ash engine oil.
Specification: Critical for diesel engines, ensure the oil meets Chrysler Material Standard MS-11106.

Diesel particulate filters (DPFs) and other emissions components in the EcoDiesel require low ash oil to prevent clogging and damage. Using the wrong oil can lead to very expensive repairs.

Choosing the Right Engine Oil for Your Grand Cherokee

Beyond knowing the 2018 Jeep Grand Cherokee oil capacity, selecting the correct engine oil is equally vital. Modern engines, especially those in a capable SUV like the Grand Cherokee, are engineered with tight tolerances and specific lubrication needs.

Using the wrong oil can lead to premature wear, reduced fuel economy, and even engine failure. Always prioritize the manufacturer’s recommendations outlined in your owner’s manual.

Recommended Oil Viscosity

Oil viscosity refers to its thickness and how it flows at different temperatures. The “W” in 5W-20 stands for “winter,” indicating its cold-weather performance. The second number (e.g., 20 or 40) indicates its flow at operating temperature.

Gasoline Engines (3.6L V6, 5.7L V8): SAE 5W-20 is the standard. This viscosity provides excellent cold-start protection while maintaining optimal flow at operating temperatures.
SRT (6.4L V8): SAE 0W-40 is mandatory. This thinner oil at cold temperatures helps with quick lubrication in a high-performance engine, while the 40-weight maintains film strength under extreme heat and load.
EcoDiesel (3.0L V6): SAE 5W-30 is specified. This viscosity is suited for the demands of a modern diesel engine, balancing protection and fuel efficiency.

Sticking to these viscosities is non-negotiable for engine health.

API Certification and Specifications

The American Petroleum Institute (API) sets quality and performance standards for engine oils. Always look for the API “donut” symbol on the oil container, indicating it meets current standards.

Gasoline Engines (MS-6395): This Chrysler Material Standard ensures the oil has the necessary additives and base oil quality for your V6 or 5.7L V8. Using an oil that explicitly states it meets MS-6395 is crucial.
SRT (MS-12633): The 6.4L HEMI requires a specific synthetic formulation. Oils meeting MS-12633 are designed to withstand the extreme heat and pressures generated by this high-performance engine.
EcoDiesel (MS-11106): This specification is vital for diesel engines, particularly for protecting emissions systems like the DPF. It typically denotes a low-ash formulation.

These specifications are not just suggestions; they are engineering requirements for long-term engine health.

Conventional vs. Synthetic Oil

The debate between conventional and synthetic oil often arises. Here’s what you need to know for your 2018 Grand Cherokee:

Conventional Oil: Derived from crude oil, it’s generally less expensive. While suitable for some older engines, it offers less protection against wear and extreme temperatures compared to synthetics.
Synthetic Blend: A mix of conventional and synthetic oils, offering improved performance over conventional at a lower cost than full synthetic.
Full Synthetic Oil: Engineered from chemical compounds, full synthetics offer superior protection, better flow in cold weather, and greater resistance to breakdown under high heat. They are typically required for high-performance engines like the SRT and often recommended for extended drain intervals in other engines.

For your Grand Cherokee, especially if you drive in challenging conditions or tow regularly, opting for a quality synthetic or synthetic blend (meeting the correct specifications) is a wise investment in your engine’s longevity. The SRT and EcoDiesel engines require full synthetic oil.

Essential Tools and Materials for a DIY Oil Change

Before you get started on your 2018 Jeep Grand Cherokee oil change, gather all your tools and materials. Being prepared prevents frustration and ensures a smooth process. Having everything at hand is key, especially if you’re out at a remote campsite and need to perform maintenance.

List of Tools

Socket Wrench Set: You’ll need the correct size socket for your drain plug (often 13mm, 1/2-inch, or 15mm depending on engine).
Torque Wrench: Essential for tightening the drain plug and oil filter to specification, preventing leaks or damage.
Oil Filter Wrench: A cap-style wrench that fits your specific oil filter is best.
Jack and Jack Stands: Absolutely critical for safely lifting and supporting your vehicle. Never work under a vehicle supported only by a jack.
Wheel Chocks: To prevent the vehicle from rolling.
Funnel: For cleanly pouring new oil into the engine.
Drain Pan: Large enough to hold the full 2018 Jeep Grand Cherokee oil capacity (plus a little extra to be safe).
Gloves: Protect your hands from oil and grime.
Rags or Shop Towels: For cleaning up spills.
Safety Glasses: Protect your eyes from splashes.

List of Materials

New Engine Oil: The correct type and amount, as discussed above. Always buy an extra quart just in case.
New Oil Filter: Ensure it’s the correct filter for your specific engine (e.g., Mopar, Wix, Purolator).
New Drain Plug Washer/Gasket: Often a crush washer, it’s a cheap part that prevents leaks. Always replace it.

Having these items ready will make the process much more efficient and safer.

Step-by-Step Guide to Changing Your 2018 Jeep Grand Cherokee’s Oil

Performing your own oil change is a rewarding experience that gives you a deeper understanding of your vehicle. Follow these steps carefully to ensure a successful and safe oil change for your 2018 Grand Cherokee.

Safety First: Preparation is Key

Warm Up the Engine: Drive your Jeep for 5-10 minutes to warm the oil. Warm oil drains more completely.
Park on Level Ground: Ensure the vehicle is on a flat, stable surface.
Engage Parking Brake: Always activate the parking brake firmly.
Chock Wheels: Place wheel chocks behind the rear wheels (if lifting the front) or in front of the front wheels (if lifting the rear).
Lift and Secure: Use a jack to lift the front of your Grand Cherokee. Place sturdy jack stands under the frame rails and slowly lower the vehicle onto the stands. Give it a gentle shake to ensure it’s stable.

Never rush safety steps. Your well-being is paramount, especially when working under a heavy vehicle.

Draining the Old Oil

Locate Drain Plug: The oil drain plug is usually at the lowest point of the oil pan, often on the passenger side.
Position Drain Pan: Place your drain pan directly under the drain plug.
Remove Drain Plug: Using your socket wrench, carefully loosen and remove the drain plug. Be prepared for oil to flow out immediately.
Let it Drain: Allow the oil to drain completely. This can take 10-15 minutes.
Inspect and Replace Washer: Once the oil flow slows to a drip, clean the drain plug and install a new crush washer.
Reinstall Drain Plug: Hand-tighten the drain plug, then use your torque wrench to tighten it to the manufacturer’s specification (check your manual, typically around 20-25 ft-lbs). Do not overtighten!

A new drain plug washer is cheap insurance against leaks. Always use one.

Replacing the Oil Filter

Locate Oil Filter: The oil filter location varies by engine. On the 3.6L Pentastar, it’s typically a cartridge filter on top of the engine. On HEMI engines, it’s usually a spin-on canister filter on the side of the engine block.
Place Drip Pan: Position a small drip pan or rags underneath the filter area to catch any residual oil.
Remove Old Filter:
- Cartridge Filter (e.g., 3.6L V6): Use a socket wrench to unscrew the plastic cap housing the filter. Carefully pull out the old filter element.
- Spin-on Filter (e.g., HEMI): Use your oil filter wrench to loosen the filter. Once loose, unscrew it by hand.
Clean Filter Area: Wipe down the area where the filter mounts.
Prepare New Filter:
- Cartridge Filter: Replace the O-rings on the filter cap with the new ones provided with the filter. Install the new filter element into the cap.
- Spin-on Filter: Apply a thin film of fresh oil to the rubber gasket of the new filter.
Install New Filter:
- Cartridge Filter: Screw the cap back into place and torque to specification (refer to manual, often around 18 ft-lbs).
- Spin-on Filter: Hand-tighten the new filter until snug, then turn an additional 3/4 to 1 full turn (or follow filter manufacturer’s instructions). Do not overtighten with a wrench.

Proper filter installation is key to preventing leaks and ensuring clean oil flow.

Refilling with Fresh Oil

Lower Vehicle: Carefully raise your Jeep off the jack stands, remove the stands, and then lower the vehicle completely to level ground.
Locate Oil Fill Cap: It’s usually on top of the engine, clearly marked with an oil can symbol.
Insert Funnel: Place a clean funnel into the oil fill opening.
Pour New Oil: Slowly add the recommended amount of new engine oil. For example, if you have a 3.6L V6, pour in 5.5 quarts first.
Check Dipstick: Wait a few minutes for the oil to settle. Pull out the dipstick, wipe it clean, reinsert it fully, then pull it out again. Check the oil level. It should be between the “MIN” and “MAX” marks.
Top Off (If Needed): Add small amounts of oil (e.g., 1/4 quart at a time), rechecking the dipstick until the level is within the safe range. Avoid overfilling.
Replace Cap: Securely replace the oil fill cap.

Always fill slightly under the full capacity, then check and top off. It’s easier to add oil than to remove an overfill.

Final Checks and Proper Disposal

Start Engine: Start your Jeep and let it run for a minute or two. The oil pressure light should turn off quickly.
Check for Leaks: While the engine is running, look underneath for any oil leaks around the drain plug and oil filter.
Turn Off Engine: Shut off the engine and wait 5-10 minutes for the oil to settle.
Final Dipstick Check: Recheck the oil level on the dipstick. Adjust if necessary.
Reset Oil Life Monitor: Consult your owner’s manual for instructions on how to reset the oil change indicator. This is crucial for accurate monitoring.
Dispose of Old Oil: Pour the old oil from your drain pan into empty oil containers. Take it to an automotive parts store, service station, or local recycling center that accepts used motor oil. Never pour used oil down the drain or into the environment.

Completing these steps ensures your oil change is done correctly and responsibly. You’ve successfully managed the 2018 Jeep Grand Cherokee oil capacity and changed your own oil!

Common Oil Change Mistakes and Troubleshooting

Even experienced DIYers can make mistakes. Knowing the common pitfalls can help you avoid them and troubleshoot if something goes wrong.

Overtightening Drain Plug or Filter

This is a very common mistake. Overtightening can strip the threads on the oil pan (a costly repair) or crack the oil filter housing (especially plastic cartridge filter caps).

Solution: Always use a torque wrench for the drain plug and cartridge filter cap. For spin-on filters, hand-tighten until snug, then add the specified extra turn. If you suspect stripped threads, stop immediately and seek professional help.

A stripped drain plug means a new oil pan, which is a big job.

Using the Wrong Oil Type

As discussed, using the incorrect viscosity or specification (e.g., non-low ash diesel oil, incorrect MS standard) can lead to accelerated wear, poor performance, and damage to emissions systems.

Solution: Always refer to your owner’s manual and the specific engine requirements. If you’ve used the wrong oil, it’s best to drain it and refill with the correct type as soon as possible.

A few extra dollars for the right oil is an investment, not an expense.

Dealing with a Leaky Drain Plug or Filter

A leak after an oil change is frustrating but usually fixable.

Drain Plug Leak: Most often, this is due to a forgotten or improperly seated new crush washer, or an overtightened/undertightened plug. Check the washer first. If it’s crushed unevenly or missing, replace it. Ensure the plug is torqued correctly.
Oil Filter Leak: Could be a loose filter, a damaged filter gasket, or a forgotten old filter gasket stuck to the engine block. Double-check the filter is snug (not overtightened) and that only one gasket is present.

Address any leaks immediately to prevent significant oil loss and potential engine damage.

Oil Change Intervals and Monitoring Oil Life

Knowing the 2018 Jeep Grand Cherokee oil capacity is only part of the equation; understanding when to change the oil is equally important. Modern vehicles use sophisticated systems to help you.

Manufacturer Recommended Intervals

For most 2018 Jeep Grand Cherokees with gasoline engines, the recommended oil change interval is every 10,000 miles or 12 months, whichever comes first, when using the specified engine oil (synthetic blend or full synthetic meeting MS-6395).

For the EcoDiesel, intervals can be similar, but always check your manual, as some diesel intervals might be shorter under certain conditions. The SRT models might also have different recommendations due to their high-performance nature.

Driving Conditions and Oil Life Monitoring System

Your Jeep Grand Cherokee is equipped with an Oil Life Monitoring (OLM) system. This system doesn’t just count miles; it monitors various factors like engine temperature, RPMs, vehicle speed, and operating conditions to determine when your oil truly needs changing.

Severe Duty: If you frequently drive in severe conditions (e.g., extreme temperatures, heavy towing, extensive idling, dusty off-road environments, short trips, or stop-and-go traffic), your OLM will likely recommend an oil change sooner than the standard 10,000 miles.
Trust the System: It’s generally best to follow the OLM’s recommendations. When the “Change Oil” message appears on your dash, it’s time for service.

Off-road enthusiasts, especially, should pay close attention to the OLM, as demanding conditions accelerate oil degradation.

Checking Your Oil Level Correctly

Even with an OLM, regularly checking your oil level manually is a good habit. This helps you catch potential leaks or excessive oil consumption between changes.

Park on Level Ground: Ensure the vehicle is on a flat surface.
Warm Engine, then Wait: Drive the Jeep to operating temperature, then turn off the engine and wait at least 5-10 minutes for the oil to drain back into the pan.
Pull and Wipe Dipstick: Locate the yellow or orange dipstick handle, pull it out, and wipe it clean with a rag.
Reinsert and Check: Reinsert the dipstick fully, wait a few seconds, then pull it out again. The oil level should be between the two marks (often “MIN” and “MAX” or holes).
Add if Low: If the level is below the “MIN” mark, add oil slowly, checking frequently, until it’s within the safe operating range.

A healthy engine shouldn’t consume excessive oil between changes. If you find yourself frequently topping off, investigate the cause.

Frequently Asked Questions About 2018 Jeep Grand Cherokee Oil

Here are some common questions we get from fellow Jeep owners and DIY mechanics.

Can I use a different brand of oil filter for my 2018 Grand Cherokee?

Yes, you can use aftermarket oil filters. However, always ensure the filter meets or exceeds the OEM (Original Equipment Manufacturer) specifications for your specific engine. Reputable brands like Wix, Mann, Purolator, and Fram (their higher-end models) are generally good choices. Avoid very cheap, no-name filters, as they may not offer adequate filtration or proper fitment.

What happens if I overfill the oil in my 2018 Grand Cherokee?

Overfilling the oil can be as detrimental as underfilling. Excess oil can be churned by the crankshaft, leading to aeration (foaming) of the oil. This reduces its lubricating properties, can cause increased oil pressure, and may lead to oil seals leaking. In severe cases, it can damage the catalytic converter. If you’ve overfilled, it’s best to drain the excess oil until the level is correct.

Is synthetic oil really necessary for my 2018 Jeep Grand Cherokee?

For the 6.4L SRT HEMI and 3.0L EcoDiesel, full synthetic oil is absolutely necessary and required by the manufacturer due to their specific engineering and operating conditions. For the 3.6L V6 and 5.7L HEMI, while the manual may recommend a synthetic blend meeting MS-6395, using a full synthetic oil (that still meets MS-6395) can offer enhanced protection, especially if you drive in harsh conditions, tow, or want extended drain intervals (always follow OLM or manual recommendations). It’s a wise upgrade for longevity.

How often should I check my oil level?

It’s a good practice to check your oil level at least once a month, or every few fuel fill-ups. This routine check helps you catch any unexpected oil consumption or leaks before they become serious problems. It’s especially important before long trips or after demanding off-road excursions.

What if my oil change light doesn’t reset?

First, double-check your owner’s manual for the exact procedure to reset the oil life monitor. The process often involves turning the ignition to the ON/RUN position (without starting the engine), pressing the accelerator pedal fully three times within 10 seconds, and then turning the ignition off. If it still doesn’t reset, there might be an issue with the sensor or the system, and it might be worth having a professional diagnose it.

Conclusion

Mastering the 2018 Jeep Grand Cherokee oil capacity and executing a proper oil change is a fundamental skill for any vehicle owner, especially those who rely on their Jeep for adventure. By understanding your specific engine’s needs, choosing the right oil, and following our detailed steps, you’re not just performing maintenance—you’re investing in the longevity and reliability of your capable SUV.

Regular, meticulous oil changes are critical for protecting your engine from wear, ensuring peak performance, and avoiding costly repairs down the trail. Don’t underestimate the power of fresh, clean oil. Take pride in your DIY efforts, knowing you’ve given your Grand Cherokee the care it deserves.

Now, go forth, conquer those trails, and stay confident that your engine’s heart is beating strong. Stay safe and stay comfortable!

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Thomas Corle

Founder & Automobile expert at FatBoysOffroad

Automobile expert and off-road enthusiast, sharing in-depth knowledge of vehicles, gear, and adventures. Helping readers make smart decisions and enjoy the thrill of off-roading safely and confidently.