Choosing the right oil for your 2018 Jeep Grand Cherokee is key to keeping your engine running smoothly and extending its life. Using the correct oil type and following the recommended maintenance schedule can also boost your SUV’s performance and fuel efficiency.
If you’re unsure about what oil to use or how often to change it, you’re not alone. Many Jeep owners have similar questions, especially since the 2018 Grand Cherokee comes with several engine options.
Here’s a clear, practical guide to help you pick the right oil, understand the differences between options, and avoid common mistakes.
Understanding Your Engine And Oil Needs
The 2018 Jeep Grand Cherokee is available with different engines:
- 3.6L V6 (most common)
- 5.7L V8
- 6.4L V8 SRT
- 6.2L V8 Supercharged (Trackhawk)
- 3.0L EcoDiesel V6
Each engine has its own oil requirements. Using the wrong oil can lead to poor lubrication, more engine wear, and even serious damage.
Recommended Oil Types For Each Engine
Let’s look at which oils are best for each engine type in the 2018 Grand Cherokee.
| Engine | Recommended Oil Type | Oil Capacity (with filter) |
|---|---|---|
| 3.6L V6 | SAE 0W-20 (synthetic) | 6 quarts |
| 5.7L V8 | SAE 5W-20 (synthetic) | 7 quarts |
| 6.4L V8 SRT | SAE 0W-40 (synthetic) | 7 quarts |
| 6.2L V8 Supercharged | SAE 0W-40 (synthetic) | 8.3 quarts |
| 3.0L EcoDiesel V6 | SAE 5W-40 (synthetic diesel oil) | 8 quarts |
The owner’s manual always gives the final answer, but this guide covers the main requirements for each engine.
Why Synthetic Oil Is Recommended
Most 2018 Grand Cherokees require full synthetic oil. Synthetic oils offer better protection, especially in extreme temperatures. They also resist breaking down, which helps your engine run cleaner and longer.
Some benefits of full synthetic oil:
- Improved engine protection under heavy loads or high speed
- Better fuel economy due to less friction
- Longer intervals between oil changes
It’s tempting to use cheaper conventional oil, but it’s not worth the risk for modern engines.
Oil Change Intervals And Service Tips
How often should you change the oil in your 2018 Grand Cherokee? For most drivers using synthetic oil:
- Every 8,000–10,000 miles or once per year, whichever comes first.
However, if you drive in extreme conditions (towing, short trips, very hot or cold weather), change it every 5,000–6,000 miles. Always replace the oil filter at every oil change.
Here’s a quick comparison of oil change intervals based on driving style:
| Driving Condition | Recommended Interval |
|---|---|
| Normal (highway, mixed) | 8,000–10,000 miles |
| Severe (towing, extreme temps) | 5,000–6,000 miles |
One insight many beginners miss: Short trips are hard on your oil. If you often drive less than 10 miles per trip, consider the shorter interval.
Choosing The Right Brand And Certification
Not all oils are created equal. Look for these certifications on the oil container:
- API (American Petroleum Institute)
- ILSAC (International Lubricant Standardization and Approval Committee)
- MS-6395 (Chrysler’s standard for many Jeep engines)
Some well-known brands that meet these standards include Mobil 1, Pennzoil, Valvoline, and Castrol. For diesel engines, check for API CK-4 or ACEA C3 approval.
Common Mistakes When Choosing Oil
- Using the wrong viscosity. Always match the numbers, like 0W-20 or 5W-40, to what’s listed for your engine.
- Mixing different oil types. Don’t mix synthetic with conventional oil. This can reduce the benefits.
- Ignoring certifications. If oil doesn’t have the right certifications, it may not protect your engine well.
- Overfilling or underfilling. Too much or too little oil can cause problems. Check the dipstick after every change.
Two Overlooked Details
- Oil filter quality matters. A poor filter can let dirt and debris circulate, wearing out your engine faster. Always use a high-quality filter.
- Check for leaks after changing oil. Even a small leak can cause big problems over time. Look under your Jeep after an oil change, especially if you do it yourself.
Should You Do Your Own Oil Change?
Changing oil on a Jeep Grand Cherokee is possible for DIYers with basic tools. The oil filter and drain plug are accessible, but the vehicle is heavy and may require jack stands or ramps for safe access. Always recycle old oil properly.
If you’re not confident, a professional oil change can save time and avoid mistakes. Some shops offer oil change packages that include a multi-point inspection, which can catch other issues early.
Where To Find More Information
The best source is always your owner’s manual or the official Jeep website. For detailed specifications and maintenance tips, you can visit the Jeep Owner’s Center.
Frequently Asked Questions
What Happens If I Use The Wrong Oil In My 2018 Grand Cherokee?
Using the wrong oil can cause poor lubrication, increased engine wear, and in some cases, engine damage. Always use the oil type listed for your engine.
Can I Use Regular Oil Instead Of Synthetic In My Jeep?
Most 2018 Grand Cherokee engines require full synthetic oil. Using regular oil can void your warranty and reduce engine life.
How Do I Know When My Jeep Really Needs An Oil Change?
Watch for the oil change indicator on your dashboard, check the oil level and color on the dipstick, and follow your maintenance schedule. Black, gritty oil or a low level means it’s time.
Are High-mileage Oils Good For Older Grand Cherokees?
If your Jeep has over 75,000 miles, high-mileage synthetic oils can help reduce leaks and wear, especially if you notice oil loss.
Is It Okay To Switch Oil Brands Between Changes?
Yes, as long as the oil meets the correct specifications and certifications. Stick to one brand if possible, but switching won’t hurt your engine if you use the right type.
Choosing the right oil for your 2018 Jeep Grand Cherokee keeps your engine healthy, improves performance, and saves money on repairs. Always check your engine type and follow the recommended oil type and interval.
With a little attention, your Grand Cherokee will stay strong for years to come.
