Your 2018 Jeep Grand Cherokee is more than just a vehicle; it’s an investment, a companion for adventures, and a trusty workhorse. Keeping its heart—the engine—running smoothly is paramount, especially when tackling trails or long hauls. Neglecting proper engine care can lead to costly repairs and leave you stranded far from home.
This comprehensive guide from FatBoysOffroad will demystify the crucial aspects of engine health, specifically focusing on the 2018 Jeep Grand Cherokee oil type and capacity. We promise to provide you with all the expert insights you need.
We’ll dive deep into choosing the right lubricants for your specific engine, cover the exact capacities, walk you through a DIY oil change, and share expert tips to keep your WK2 performing its best, whether on pavement or challenging terrain. Let’s get your Jeep ready for anything!
Understanding Your 2018 Jeep Grand Cherokee Oil Type and Capacity
Getting the right oil for your 2018 Grand Cherokee isn’t just a recommendation; it’s a requirement for optimal engine performance and longevity. Different engines demand different specifications.
Using the incorrect oil can lead to premature wear, reduced fuel efficiency, and even engine damage. We’ll break down what you need to know for each engine variant.
The Importance of API and ILSAC Ratings
When selecting engine oil, don’t just look at the viscosity. The API (American Petroleum Institute) service rating indicates the oil’s performance level. For gasoline engines, you’ll typically see “SN” or “SP.”
ILSAC (International Lubricant Standardization and Approval Committee) GF-5 or GF-6 ratings are also crucial. These signify improved fuel economy and engine protection, especially against low-speed pre-ignition (LSPI) in modern direct-injection engines.
For diesel engines, the ratings are different, often CJ-4 or CK-4, indicating suitability for diesel particulate filters (DPF) and other emissions equipment.
Engine-Specific Oil Requirements for Your WK2 Grand Cherokee
The 2018 Grand Cherokee came with several robust engine options, each with unique lubrication needs. It’s vital to know which engine is under your hood.
3.6L Pentastar V6 Engine
- Oil Type: SAE 5W-20 full synthetic motor oil.
- Specifications: Must meet API SN/SP and ILSAC GF-5/GF-6 standards.
- Capacity: Approximately 6 quarts (5.7 liters) with a new oil filter.
- Recommendation: Full synthetic oil is highly recommended for its superior protection and longer drain intervals.
5.7L Hemi V8 Engine
- Oil Type: SAE 5W-20 full synthetic motor oil.
- Specifications: Must meet API SN/SP and ILSAC GF-5/GF-6 standards.
- Capacity: Approximately 7 quarts (6.6 liters) with a new oil filter.
- Recommendation: Full synthetic is crucial for the Hemi’s performance and cylinder deactivation system (MDS).
6.4L SRT Hemi V8 Engine
- Oil Type: SAE 0W-40 full synthetic motor oil.
- Specifications: Must meet Chrysler Material Standard MS-12633. This is non-negotiable for SRT engines.
- Capacity: Approximately 7 quarts (6.6 liters) with a new oil filter.
- Recommendation: Only use oils explicitly stating compliance with MS-12633.
6.2L Supercharged Trackhawk Hemi V8 Engine
- Oil Type: SAE 0W-40 full synthetic motor oil.
- Specifications: Must meet Chrysler Material Standard MS-12633. The supercharged Hemi requires specific formulation.
- Capacity: Approximately 7 quarts (6.6 liters) with a new oil filter.
- Recommendation: Like the SRT, strict adherence to MS-12633 is critical for this high-performance engine.
3.0L EcoDiesel V6 Engine
- Oil Type: SAE 5W-30 low ash synthetic diesel motor oil.
- Specifications: Must meet API CJ-4 or CK-4 and Chrysler Material Standard MS-11106. The “low ash” part is vital for your DPF.
- Capacity: Approximately 10.5 quarts (9.9 liters) with a new oil filter.
- Recommendation: Using non-low ash oil can quickly damage your diesel particulate filter (DPF), leading to expensive repairs.
Why the Right Engine Oil Matters for Your Grand Cherokee
Engine oil is the lifeblood of your vehicle. It does far more than just lubricate moving parts. It cleans, cools, seals, and protects against corrosion.
Using the correct oil type and capacity ensures all these functions are performed optimally. This is especially true for the diverse engine lineup of the 2018 Grand Cherokee.
Protection Against Wear and Tear
Modern engines, especially high-performance or diesel variants, operate under extreme conditions. The right oil provides a protective film that prevents metal-on-metal contact, significantly extending engine life.
Wrong viscosity can lead to film breakdown or excessive drag, both detrimental. This is why knowing your 2018 Jeep Grand Cherokee oil type and capacity is so vital.
Optimal Fuel Efficiency and Performance
The correct viscosity allows the engine to operate with less internal friction. This translates directly into better fuel economy and more responsive performance.
Thicker oil than specified can make the engine work harder, while thinner oil might not provide adequate protection at operating temperature.
Maintaining Emissions Systems
For EcoDiesel owners, using the specified low-ash oil is critical for the Diesel Particulate Filter (DPF). Incorrect oil can clog the DPF, leading to reduced performance and costly regeneration issues or replacement.
For gasoline engines, the right oil helps prevent deposits that can impact catalytic converter efficiency.
Step-by-Step: Performing an Oil Change on Your 2018 Grand Cherokee
Changing your own oil is one of the most satisfying and cost-effective DIY maintenance tasks. With the right tools and a little patience, you can easily handle this. Always prioritize safety!
Tools and Materials You’ll Need
- New engine oil (correct type and capacity for your engine)
- New oil filter (e.g., Mopar, Wix, Mann, Purolator)
- Oil filter wrench (cap-style is often best for the WK2’s canister filter)
- Socket wrench and appropriate socket for drain plug (usually 13mm or 16mm)
- Drain pan (minimum 7-quart capacity, more for EcoDiesel)
- Funnel
- Jack and jack stands (or sturdy ramps)
- Wheel chocks
- Gloves and safety glasses
- Clean shop rags or paper towels
- New drain plug washer (crush washer)
- Torque wrench (optional, but highly recommended for drain plug and filter housing)
Safety First!
- Park on Level Ground: Ensure your Jeep is on a flat, stable surface.
- Engage Parking Brake: Always set the parking brake firmly.
- Chock Wheels: Place wheel chocks behind the rear wheels if you’re lifting the front.
- Lift Safely: Use a hydraulic jack to lift the front of the vehicle and immediately support it with sturdy jack stands. Never work under a vehicle supported only by a jack.
- Wear PPE: Put on your safety glasses and gloves. Hot oil can cause severe burns.
The Oil Change Process
Once your Jeep is safely elevated and secured, you’re ready to begin.
- Warm Up Engine (Slightly): Drive the Jeep for 5-10 minutes to warm the oil. Warm oil drains more completely.
- Locate Drain Plug: Position your drain pan directly under the oil pan drain plug.
- Remove Drain Plug: Using your socket wrench, carefully loosen and remove the drain plug. Be ready for the oil to flow out. It will be hot!
- Allow to Drain: Let the oil drain completely. This can take 10-15 minutes.
- Replace Drain Plug Washer: While oil is draining, prepare your new drain plug washer. This is crucial for preventing leaks.
- Reinstall Drain Plug: Once drained, clean around the drain hole and reinstall the drain plug with the new washer. Hand-tighten, then use your socket wrench to tighten to spec (typically 20-25 ft-lbs for V6/V8, consult your owner’s manual). Do not overtighten!
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Locate and Remove Oil Filter: The oil filter location varies by engine.
- V6/V8 (Pentastar/Hemi): The oil filter is typically a cartridge type located on top of the engine, under an engine cover. Use your oil filter wrench to loosen the cap.
- EcoDiesel: The oil filter is often a cartridge type, sometimes located near the front of the engine, accessible from above or below.
Have rags ready to catch any drips when removing the filter element. Ensure the old O-ring comes off with the old filter.
- Install New Oil Filter: Lubricate the new filter’s O-ring with a dab of fresh oil. Install the new filter element and screw the cap back on. Tighten according to manufacturer specs (usually marked on the cap, often 18-25 ft-lbs).
- Lower Vehicle: Carefully lower your Grand Cherokee off the jack stands.
- Add New Oil: Using a funnel, slowly add the specified amount of new engine oil. Add about a quart less than the full capacity, then check the dipstick.
- Check Oil Level: Start the engine and let it run for a minute to circulate the oil. Shut it off, wait 5 minutes, then check the dipstick. Add oil slowly until it reaches the “FULL” mark. Do not overfill!
- Inspect for Leaks: Look under the vehicle for any signs of leaks around the drain plug or oil filter.
- Reset Oil Change Indicator: Consult your owner’s manual for instructions on how to reset the “Oil Change Required” message on your dash.
Choosing the Best Oil Filter for Your WK2
An oil filter is just as important as the oil itself. It traps contaminants, preventing them from circulating through your engine. Don’t skimp on this component.
For your 2018 Jeep Grand Cherokee, you’ll almost certainly be using a cartridge-style filter. These are different from the spin-on filters of older vehicles.
Recommended Oil Filter Brands
- Mopar: The OEM (Original Equipment Manufacturer) filter is always a safe bet. It’s designed specifically for your Jeep’s engine.
- Wix: A highly respected aftermarket brand known for quality filtration.
- Mann-Filter: Often an OEM supplier to European manufacturers, they produce excellent cartridge filters.
- PurolatorONE/Mobil 1: Good quality aftermarket options that offer solid performance.
Avoid generic, no-name filters. They might save you a few bucks now, but inadequate filtration can lead to premature engine wear in the long run.
Advanced Tips for Off-Roaders and Heavy-Duty Use
For those who push their Grand Cherokee harder, either on the trails or by towing, a few extra considerations can go a long way.
Shorter Oil Change Intervals
If you frequently drive in dusty conditions, tow heavy loads, or engage in rigorous off-roading, consider shortening your oil change intervals. While the owner’s manual might suggest 10,000 miles, heavy use can necessitate changes every 5,000-7,500 miles.
This is cheap insurance against premature engine wear.
Consider an Oil Analysis
For serious off-roaders or those wanting to optimize their maintenance schedule, consider sending a sample of your used oil for analysis. Companies like Blackstone Labs can tell you exactly what’s going on inside your engine and if your oil is holding up.
This can help you fine-tune your oil change intervals and spot potential issues early.
Check Oil Frequently
Off-roading can sometimes cause oil consumption, especially on steep inclines or declines. Make it a habit to check your oil level before and after any significant off-road excursion.
Always carry an extra quart of the correct oil type with you on longer trips.
Common Questions & Troubleshooting for Your 2018 Jeep Grand Cherokee Oil Type and Capacity
Even with the right information, questions can arise. Here are some common concerns.
What if I use the wrong oil type?
Using the wrong oil for a short period might not cause immediate catastrophic failure, but it’s not recommended. Incorrect viscosity can lead to increased wear, reduced fuel economy, and potential issues with variable valve timing systems or cylinder deactivation.
For EcoDiesel engines, using non-low-ash oil can rapidly damage the DPF.
How often should I change my oil?
Refer to your owner’s manual for the manufacturer’s recommended interval, usually between 7,500 to 10,000 miles or once a year, whichever comes first, for normal driving conditions.
As mentioned, heavy-duty use or extreme conditions warrant more frequent changes.
My oil change light came on, but I just changed the oil.
The oil change light on your 2018 Grand Cherokee is a maintenance reminder, not a sensor that detects oil quality. You need to manually reset it after each oil change.
Consult your owner’s manual for the exact steps, which usually involve a sequence of turning the ignition on/off and pressing the accelerator pedal.
Frequently Asked Questions About 2018 Jeep Grand Cherokee Oil
What is the recommended oil for a 2018 Jeep Grand Cherokee 3.6L Pentastar?
For the 3.6L Pentastar V6, the recommended oil is SAE 5W-20 full synthetic, meeting API SN/SP and ILSAC GF-5/GF-6 standards. The capacity is approximately 6 quarts with a filter change.
What is the oil capacity for a 2018 Grand Cherokee 5.7L Hemi?
The 5.7L Hemi V8 in the 2018 Grand Cherokee requires approximately 7 quarts (6.6 liters) of SAE 5W-20 full synthetic oil when changing the filter. Ensure it meets API SN/SP and ILSAC GF-5/GF-6 specifications.
Can I use conventional oil in my 2018 Jeep Grand Cherokee?
While some older models might tolerate it, for your 2018 Grand Cherokee, especially the Pentastar V6 and Hemi V8s, full synthetic oil is strongly recommended or even mandatory (like for the SRT/Trackhawk and EcoDiesel). Synthetic oils offer superior protection, performance, and longevity, which modern engines demand.
Is 0W-40 oil only for SRT/Trackhawk models?
Yes, SAE 0W-40 full synthetic oil, specifically meeting Chrysler MS-12633, is mandatory for the 6.4L SRT and 6.2L Trackhawk Hemi V8 engines in the 2018 Grand Cherokee. Using any other oil type can severely impact these high-performance engines.
How often should I check my oil level?
It’s good practice to check your oil level at least once a month, or before any long trip or off-road adventure. Modern engines, especially those with higher mileage, can consume a small amount of oil, so regular checks help prevent running low.
Keep Your Jeep Roaring
Mastering the specifics of your 2018 Jeep Grand Cherokee oil type and capacity is a fundamental step in responsible vehicle ownership. Whether you’re a seasoned DIY mechanic or just starting, this guide provides the essential knowledge to keep your WK2 performing flawlessly.
Regular maintenance with the correct fluids is the best way to ensure your Grand Cherokee remains a reliable partner for all your adventures, on or off the road. Don’t compromise on engine health; your Jeep deserves the best.
Stay safe and stay comfortable!
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