The 2018 Jeep Grand Cherokee remains one of the most popular midsize SUVs thanks to its strong towing capability, off-road performance, luxury features, and multiple engine options. Whether your Grand Cherokee is equipped with the dependable 3.6L Pentastar V6, powerful 5.7L HEMI V8, performance-focused 6.4L V8, supercharged 6.2L Trackhawk engine, or diesel powertrain, using the correct engine oil is essential for long-term reliability.
Proper oil lubrication helps reduce engine wear, improve fuel economy, maintain variable valve timing systems, and protect internal engine components from excessive heat and sludge buildup. Regular oil changes are one of the most important maintenance services for keeping your Jeep running smoothly.
What Oil Does a 2018 Jeep Grand Cherokee Take?
The correct oil type for a 2018 Jeep Grand Cherokee depends on the engine installed in the vehicle. Most models equipped with the popular 3.6L Pentastar V6 require SAE 0W-20 full synthetic oil. HEMI-powered models typically use 5W-20, while high-performance SRT and Trackhawk engines require 0W-40 synthetic oil.
Using the factory-recommended viscosity helps maintain proper lubrication, fuel efficiency, engine cooling, and timing system performance. Full synthetic oil is strongly recommended for all engine options.
Best Overall Choice: Full synthetic motor oil that meets Jeep and Chrysler MS specifications provides the best protection, especially during hot weather, towing, and extended driving conditions.
2018 Jeep Grand Cherokee Oil Capacity & Oil Type Chart
Oil capacity varies significantly depending on the engine option. Always verify the final oil level using the dipstick after refilling.
Important: Using the wrong oil viscosity may affect fuel economy, engine wear protection, and variable valve timing performance. Always follow factory specifications for your specific engine.
Best Oil for a 2018 Jeep Grand Cherokee
Premium synthetic oil provides better protection against heat, sludge buildup, oxidation, and wear than conventional oils.
Recommended Oil Brands
- Mobil 1 Advanced Full Synthetic
- Pennzoil Platinum Full Synthetic
- Valvoline Advanced Synthetic
- Castrol EDGE Full Synthetic
- Royal Purple High Performance Synthetic
- Mopar MaxPro Synthetic Oil
Benefits of Synthetic Oil
- Improved cold-weather starting
- Better high-temperature protection
- Reduced engine wear
- Cleaner engine internals
- Longer service intervals
- Lower sludge formation
2018 Jeep Grand Cherokee Oil Change Interval
Most 2018 Grand Cherokee models are equipped with an Oil Life Monitoring System, but many technicians recommend shorter service intervals for maximum engine longevity.
2018 Jeep Grand Cherokee Oil Change Cost
Oil change costs vary depending on engine size, oil type, and service location. Larger HEMI and diesel engines require more oil and typically cost more to service.
How to Change Oil in a 2018 Jeep Grand Cherokee
Common 2018 Jeep Grand Cherokee Engine Problems
Oil Cooler Housing Leaks
The 3.6L Pentastar engine is known for oil cooler housing leaks that can lead to oil loss and contamination concerns if not repaired promptly. Many owners report failures of the original plastic housing assembly.
Oil Consumption
Some owners have reported oil consumption concerns, making regular oil level checks important between service intervals.
Valve Train Noise
Pentastar and HEMI engines may develop valvetrain noise if oil changes are neglected or low oil levels occur.
Oil in Coolant Reservoir
Owners commonly report oil cooler failures causing oil contamination in the cooling system, particularly on Pentastar-equipped models.
Signs Your Grand Cherokee Needs an Oil Change
- Dark or dirty oil
- Oil life monitor warning
- Engine ticking noise
- Reduced fuel economy
- Burning oil smell
- Hard starting
- Engine running rough
- Visible oil leaks
Maintenance Tips for Longer Engine Life
- Use full synthetic oil
- Replace the oil filter during every oil change
- Inspect oil cooler housing for leaks
- Check oil levels monthly
- Follow Jeep maintenance schedules
- Inspect for coolant contamination
- Keep air filters clean
- Address warning lights immediately
Frequently Asked Questions
What oil does a 2018 Jeep Grand Cherokee use?
Most 3.6L Pentastar models use SAE 0W-20 full synthetic oil, while V8 engines may require 5W-20 or 0W-40 depending on the engine.
How much oil does a 2018 Jeep Grand Cherokee hold?
The 3.6L Pentastar engine holds approximately 5.9 to 6 quarts of oil with a filter change.
Can I use synthetic oil in my Grand Cherokee?
Yes. Full synthetic oil is strongly recommended and provides better engine protection and performance.
How often should oil be changed in a 2018 Grand Cherokee?
Most owners change oil every 5,000 to 10,000 miles depending on driving conditions and oil type.
What is the average oil change cost for a 2018 Jeep Grand Cherokee?
Most oil changes cost between $70 and $250 depending on engine size, oil type, and service location.
Final Thoughts
The 2018 Jeep Grand Cherokee offers excellent performance, comfort, and capability across its entire engine lineup. Proper oil maintenance remains one of the most important factors in maximizing engine life and preventing expensive repairs.
For most owners, using high-quality full synthetic oil, replacing the oil filter regularly, and monitoring oil levels between services will help keep the Grand Cherokee running reliably for many years.
Quick Summary
- Most Common Engine: 3.6L Pentastar V6
- Recommended Oil: SAE 0W-20 Synthetic
- Oil Capacity: 5.9–6 Quarts
- Oil Change Interval: 5,000–10,000 Miles
- Preferred Oil Type: Full Synthetic
- Common Issue: Oil Cooler Housing Leaks
- Average Oil Change Cost: $70–$250
- Best Practice: Check Oil Level Monthly