You love your Jeep Cherokee. Whether it’s tackling city commutes, hauling gear for a weekend adventure, or crawling over rocks on a trail, your 2018 model is a reliable companion. But like any true workhorse, it needs the right care to keep performing at its best.
When it comes to maintaining your rugged 2018 Jeep Cherokee, few things are as critical as choosing the correct 2018 Jeep Cherokee oil type. Using the wrong engine oil can lead to reduced fuel efficiency, premature engine wear, and even costly damage over time.
Don’t just grab any bottle off the shelf. This comprehensive guide from FatBoysOffroad will equip you with all the expert knowledge you need. We’ll dive deep into oil specifications, offer practical DIY tips, and ensure your Cherokee’s engine stays healthy for years to come.
Get ready to become an oil change pro and give your Jeep the care it deserves!
Understanding the Recommended 2018 Jeep Cherokee Oil Type
Every engine is designed with specific lubrication requirements. For your 2018 Jeep Cherokee, adhering to these specifications isn’t just a suggestion; it’s essential for optimal engine health and longevity.
The manufacturer’s recommendation is always your primary source of truth. You’ll find this crucial information in your owner’s manual. It specifies both the viscosity grade and the American Petroleum Institute (API) service classification.
Decoding Oil Viscosity for Your Cherokee
Viscosity refers to an oil’s resistance to flow. Think of it like syrup versus water. Engine oil needs to be thin enough to flow when cold but thick enough to protect when hot.
- For most 2018 Jeep Cherokee models, especially those equipped with the 2.4L Tigershark MultiAir engine or the 3.2L Pentastar V6, the recommended viscosity is SAE 5W-20.
- Some specific applications or extreme climates might suggest slight variations, but 5W-20 is the standard.
The “W” stands for “winter,” indicating the oil’s cold-start performance. The second number (20) indicates its viscosity at operating temperature. This balance ensures proper lubrication during startup and under demanding driving conditions.
API Service Classification and MOPAR Standards
Beyond viscosity, engine oils are rated by their performance standards. The API service classification indicates the type of engine the oil is designed for and its performance level.
- Your 2018 Jeep Cherokee will typically require an oil with an API SN or newer rating. SN Plus is even better, offering enhanced protection against low-speed pre-ignition (LSPI), a common issue in some direct-injection engines.
- MOPAR, Jeep’s official parts division, often specifies additional standards beyond API. Look for oils that meet or exceed Chrysler MS-6395 specification. This is a critical detail that ensures the oil is formulated to protect specific engine components and materials used in your Cherokee’s engine.
Always double-check your owner’s manual for the exact API rating and MOPAR specification. Using an oil that meets these standards guarantees compatibility and optimal protection.
Synthetic vs. Conventional vs. Blends: What’s Best for Your Trailhawk?
The world of engine oil offers several choices, each with distinct advantages. Understanding these differences will help you make an informed decision about the 2018 Jeep Cherokee oil type that best suits your driving habits and budget.
Conventional Engine Oil
Conventional oil is refined directly from crude oil. It’s the most basic and typically the least expensive option.
- It provides adequate lubrication for standard driving conditions.
- However, it breaks down faster under extreme heat and stress, leading to shorter oil change intervals.
- For a modern engine like the one in your 2018 Cherokee, especially if you drive in varying conditions or off-road, conventional oil is generally not recommended.
Synthetic Blend Engine Oil
A synthetic blend is a mix of conventional and synthetic base oils. It offers a balance between cost and performance.
- It provides better protection against wear and heat than conventional oil.
- It’s a good step up for daily drivers who might not need full synthetic but want enhanced protection.
- However, for off-road enthusiasts or those pushing their Cherokees hard, full synthetic is still the superior choice.
Full Synthetic Engine Oil
Full synthetic oil is chemically engineered to have a more uniform molecular structure. This results in superior performance characteristics.
- Enhanced Protection: Synthetic oil offers exceptional protection against wear, even under extreme temperatures and heavy loads. This is crucial for off-roading where engine temperatures can fluctuate wildly.
- Longer Intervals: It resists thermal breakdown much better than conventional oil, allowing for longer oil change intervals (though still adhere to your manual’s recommendations or specific use case).
- Improved Fuel Economy: Its lower friction properties can slightly improve fuel efficiency.
- Better Cold Starts: Synthetic oil flows more easily in cold weather, reducing engine wear during startup.
For your 2018 Jeep Cherokee, especially if you’re hitting the trails, regularly towing, or driving in harsh conditions, full synthetic 5W-20 oil meeting the MS-6395 specification is highly recommended. It’s an investment that pays off in engine longevity and reliable performance.
Essential Tools and Materials for a DIY Oil Change
Performing your own oil change on your 2018 Jeep Cherokee is a satisfying and cost-effective maintenance task. Before you begin, gather all the necessary tools and materials.
What You’ll Need:
- New Engine Oil: Approximately 5.5 to 6 quarts (check your owner’s manual for exact capacity) of the recommended 5W-20 full synthetic oil, meeting API SN/SN Plus and Chrysler MS-6395 specifications.
- New Oil Filter: A high-quality oil filter designed specifically for your 2018 Jeep Cherokee. MOPAR filters (part number MO-339 for the 3.2L V6 or MO-349 for the 2.4L) are always a safe bet.
- Oil Filter Wrench: A cap-style wrench that fits your specific oil filter.
- Drain Pan: A large capacity pan to collect the old engine oil.
- Socket Wrench Set: You’ll need a socket for the drain plug (usually 13mm or 15mm, but confirm).
- Torque Wrench: Crucial for tightening the drain plug and oil filter to specification, preventing leaks or overtightening damage.
- Jack and Jack Stands: Essential for safely lifting your vehicle. Never work under a vehicle supported only by a jack.
- Wheel Chocks: To prevent the vehicle from rolling.
- Gloves: To protect your hands from hot oil and grime.
- Shop Rags or Paper Towels: For cleanup.
- Funnel: To neatly pour new oil into the engine.
- Safety Glasses: Always protect your eyes.
Having everything ready before you start will make the process smoother and safer. A little preparation goes a long way, especially when you’re under the vehicle.
Step-by-Step DIY Oil Change for Your 2018 Jeep Cherokee
Ready to get your hands dirty? Follow these steps for a safe and effective oil change on your 2018 Jeep Cherokee. Remember, safety first!
1. Prepare Your Vehicle and Workspace
- Warm Up the Engine: Drive your Jeep for a few minutes to get the oil warm. Warm oil flows more easily, carrying away more contaminants.
- Park on Level Ground: Ensure your vehicle is on a flat, stable surface.
- Engage Parking Brake: Always activate the parking brake.
- Chock Wheels: Place wheel chocks behind the rear wheels.
- Lift and Secure: Use your jack to lift the front of the vehicle and immediately place jack stands under the frame rails. Gently lower the vehicle onto the stands. Give it a gentle shake to ensure it’s stable.
- Locate Components: Identify the oil drain plug (on the oil pan, usually at the lowest point) and the oil filter (location varies by engine, often near the front or side of the engine block).
2. Drain the Old Oil
- Position Drain Pan: Place your oil drain pan directly under the drain plug.
- Remove Drain Plug: Using the correct socket wrench, carefully loosen and remove the drain plug. Be prepared for hot oil to flow out quickly.
- Let it Drain: Allow the oil to drain completely. This can take 10-15 minutes.
- Inspect Plug: Check the drain plug and its washer (gasket). If the washer is crushed or damaged, replace it. Many new oil filters come with a fresh washer.
- Reinstall Drain Plug: Once the oil has fully drained, clean the drain plug and the area around the oil pan opening. Reinstall the drain plug, tightening it to the manufacturer’s specified torque (check your manual, typically around 20 ft-lbs). Do NOT overtighten.
3. Replace the Oil Filter
- Position Pan: Move the drain pan under the oil filter, as some oil will spill when removed.
- Remove Old Filter: Use your oil filter wrench to loosen the old filter. Once loose, you can usually unscrew it by hand.
- Clean Mounting Surface: Wipe the oil filter mounting surface on the engine block clean with a rag. Ensure no old gasket material remains.
- Prepare New Filter: Apply a thin film of new engine oil to the rubber gasket of the new oil filter. This helps create a good seal and makes future removal easier.
- Install New Filter: Screw on the new oil filter by hand until the gasket makes contact with the engine block. Then, tighten it an additional 3/4 to 1 full turn (or as specified on the filter/manual). Do NOT overtighten with a wrench.
4. Add Fresh Engine Oil
- Lower Vehicle: Carefully raise your Jeep with the jack, remove the jack stands, and lower the vehicle completely to level ground.
- Locate Oil Fill Cap: Open the hood and remove the oil fill cap, usually marked with an oil can symbol.
- Pour New Oil: Place a funnel into the oil fill opening. Slowly pour in the recommended amount of new 5W-20 engine oil (typically 5.5 to 6 quarts for the 2018 Jeep Cherokee, depending on engine size).
- Check Level: After pouring, wait a few minutes for the oil to settle. Then, pull out the dipstick, wipe it clean, reinsert it fully, and pull it out again to check the oil level. It should be between the “MIN” and “MAX” marks. Add more oil gradually if needed.
- Replace Cap: Securely replace the oil fill cap.
5. Final Checks and Cleanup
- Start Engine: Start your Jeep’s engine and let it run for a minute or two. Check for any leaks around the drain plug and oil filter. The oil pressure light on your dashboard should turn off.
- Recheck Level: Turn off the engine, wait a few minutes, and recheck the oil level on the dipstick. Adjust if necessary.
- Dispose of Old Oil: Pour the used engine oil from your drain pan into empty oil containers or a dedicated recycling container. Take it to an automotive parts store or a local recycling center. Never dump used oil down the drain or on the ground.
Congratulations! You’ve successfully changed the engine oil in your 2018 Jeep Cherokee. Remember to reset your oil change reminder in the vehicle’s onboard computer, usually accessible through the infotainment system or instrument cluster settings.
Common Mistakes and Troubleshooting During Oil Changes
Even experienced DIYers can make small errors. Knowing what to watch out for can save you headaches and potential engine damage.
Overtightening the Drain Plug or Filter
This is a very common mistake. Overtightening can strip threads on the oil pan or crack the oil filter housing. Always use a torque wrench for the drain plug and tighten the filter only by hand (plus the specified turn).
Using the Wrong Oil Type
As we’ve discussed, the 2018 Jeep Cherokee oil type is specific. Using the wrong viscosity or an oil that doesn’t meet the Chrysler MS-6395 spec can lead to insufficient lubrication, increased wear, and reduced engine life.
Forgetting to Replace the Drain Plug Washer
The small crush washer on the drain plug is designed to create a tight seal. Reusing a damaged washer or forgetting it entirely can lead to annoying (and potentially dangerous) oil leaks.
Not Cleaning the Filter Mounting Surface
Any old gasket material or debris left on the engine block where the oil filter mounts can prevent a proper seal, resulting in leaks.
Troubleshooting Leaks
If you notice oil leaking after an oil change, immediately investigate:
- Drain Plug: Is it tight enough? Is the washer properly seated and in good condition?
- Oil Filter: Is it snug? Did you lube the gasket? Is the old gasket completely removed from the engine block?
- Oil Fill Cap: Is it securely in place?
Address any leaks promptly. Even a small leak can become a major problem over time, especially when you’re far from civilization on an off-road trip.
Advanced Oil Maintenance for Off-Roaders
If your 2018 Jeep Cherokee regularly sees dirt, mud, and challenging terrain, your oil maintenance schedule might need a little extra attention. Off-roading puts unique stresses on your engine oil.
Shorter Oil Change Intervals
Dusty conditions, prolonged low-speed crawling, and steep inclines can all increase engine temperatures and contaminate your oil faster. Consider shortening your oil change intervals by 1,000-2,000 miles if you frequently go off-road.
Consider an Oil Analysis
For serious off-roaders, an oil analysis kit can be a valuable tool. You send a small sample of your used oil to a lab, and they can tell you about wear metals, contaminants (like dirt or coolant), and the remaining life of your oil. This can help you fine-tune your oil change schedule and catch potential engine issues early.
Engine Protection Accessories
For extreme conditions, consider adding an aftermarket oil cooler or a larger capacity oil pan. These modifications can help keep oil temperatures down and provide a larger reservoir of oil for better lubrication, especially during sustained climbs or high-load situations.
Remember, your engine is the heart of your off-road machine. Giving it the best possible lubrication and care means it will be there for you when you need it most, whether it’s powering through a mud pit or climbing a rocky trail. Don’t skimp on quality or diligence when it comes to engine oil.
Frequently Asked Questions About 2018 Jeep Cherokee Oil
What is the best 2018 Jeep Cherokee oil type for high mileage?
For high-mileage 2018 Jeep Cherokees, a full synthetic 5W-20 oil that meets Chrysler MS-6395 is still recommended. Many oil brands offer “high mileage” synthetic formulations that include additives designed to condition seals and reduce oil consumption in older engines. These are an excellent choice.
How often should I change the oil in my 2018 Jeep Cherokee?
The typical interval for a 2018 Jeep Cherokee using full synthetic oil is every 10,000 miles or 12 months, whichever comes first. However, if you frequently tow, drive in extreme temperatures, or engage in off-roading, consider shortening this to 5,000-7,500 miles. Always refer to your owner’s manual for specific severe-duty recommendations.
Can I use a different oil viscosity if 5W-20 isn’t available?
It is strongly recommended to stick to the manufacturer’s specified 5W-20 viscosity. Using a thicker or thinner oil can negatively impact engine performance, fuel economy, and long-term wear. In an emergency, a 5W-30 might be a temporary substitute, but switch back to 5W-20 as soon as possible.
What if my oil pressure light comes on after an oil change?
If your oil pressure light comes on after an oil change, immediately pull over safely and shut off the engine. This usually indicates a critical lack of oil pressure. Check your oil level, ensure the drain plug is secure, and verify the oil filter is properly installed and not leaking. If the issue persists, do not drive the vehicle and seek professional assistance.
Is it worth paying more for a premium oil filter?
Absolutely. A high-quality oil filter, such as a MOPAR original or a reputable aftermarket brand like Wix or Mobil 1, offers superior filtration and durability. It works in conjunction with your premium synthetic oil to protect your engine, especially in demanding conditions. It’s a small investment for significant engine protection.
Conclusion: Keep Your Cherokee Running Strong
Your 2018 Jeep Cherokee is built for adventure, and proper maintenance is the key to ensuring it’s always ready for the next one. Understanding the correct 2018 Jeep Cherokee oil type and following a diligent oil change schedule are fundamental to engine health.
By using the recommended full synthetic 5W-20 oil that meets the Chrysler MS-6395 specification, along with a quality filter, you’re providing your engine with the best possible protection against wear, heat, and contaminants. Taking the time to perform a DIY oil change safely and correctly not only saves money but also gives you a deeper connection to your vehicle.
Don’t underestimate the power of good lubrication. It’s the lifeblood of your engine, ensuring smooth operation whether you’re cruising on the highway or conquering challenging trails. Keep up with your maintenance, listen to your Jeep, and it will reward you with countless miles of reliable service.
Stay safe out there, hit those trails responsibly, and keep your FatBoysOffroad machine running like a dream!
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