A 2018 Jeep Grand Cherokee with the 3.6L V6 requires exactly six quarts of 5W-20 oil for a standard filter change. If you own the 5.7L V8 or the 6.4L V8, the amount changes to seven quarts. Knowing exactly how much oil does a 2018 Jeep Grand Cherokee take is crucial for a smooth DIY oil change or when buying supplies at the store.
Getting the oil volume wrong can lead to engine damage or poor performance. This guide covers all engine options, oil types, and step-by-step instructions. You’ll find everything you need to keep your Grand Cherokee running strong.
How Much Oil Does A 2018 Jeep Grand Cherokee Take
The answer depends entirely on your engine. The 2018 Grand Cherokee comes with three main engine choices: a 3.6L Pentastar V6, a 5.7L HEMI V8, and a 6.4L SRT V8. Each has a different oil capacity.
For the 3.6L V6, you need six quarts of oil. For the 5.7L V8, you need seven quarts. The high-performance 6.4L V8 also takes seven quarts. Always check your owner’s manual to confirm your specific engine.
Oil Capacity By Engine Type
- 3.6L Pentastar V6: 6 quarts (5.7 liters) with filter
- 5.7L HEMI V8: 7 quarts (6.6 liters) with filter
- 6.4L SRT V8: 7 quarts (6.6 liters) with filter
These numbers include the oil that fills the new filter. If you don’t pre-fill the filter, you might need slightly less. But it’s safer to have the full amount ready.
Recommended Oil Type And Viscosity
Jeep recommends 5W-20 full synthetic oil for all 2018 Grand Cherokee engines. This viscosity works well in both cold and hot weather. Some owners use 0W-20 in very cold climates, but 5W-20 is the standard spec.
Full synthetic oil provides better protection and lasts longer than conventional oil. It also helps with fuel economy and engine cleanliness. Stick with a reputable brand like Mobil 1, Pennzoil, or Castrol.
For the 5.7L and 6.4L V8 engines, you can also use 5W-30 if you live in a hot climate. But always check your owner’s manual first. Using the wrong viscosity can affect performance and warranty.
How To Check Your Oil Level Correctly
Checking oil is simple but many people do it wrong. Follow these steps to get an accurate reading on your 2018 Grand Cherokee.
- Park on level ground and turn off the engine.
- Wait at least 5 minutes for the oil to settle back into the pan.
- Pull out the dipstick, wipe it clean with a rag.
- Insert it fully, then pull it out again.
- Read the level. It should be between the min and max marks.
If the oil is below the min mark, add half a quart at a time. Check again after each addition. Overfilling is just as bad as underfilling.
Your Grand Cherokee’s dipstick is usually yellow and located near the front of the engine. On the 3.6L V6, it’s on the passenger side. On V8 engines, it’s on the driver side.
When To Check Oil
Check your oil at least once a month. Also check it before long trips or if you notice any warning lights. The oil change reminder in your Jeep will alert you when service is due, but manual checks are still important.
If you see oil on the dipstick that looks dark or gritty, it’s time for a change. Clean oil is amber and translucent. Dirty oil looks black and thick.
Step-By-Step Oil Change For 2018 Jeep Grand Cherokee
Changing your own oil saves money and gives you control over quality. Here’s how to do it properly for your 2018 Grand Cherokee.
Tools And Materials Needed
- 6 or 7 quarts of 5W-20 full synthetic oil (depending on engine)
- New oil filter (check your engine size)
- Oil filter wrench
- Socket set (usually 13mm or 15mm for drain plug)
- Drain pan
- Funnel
- Gloves and rags
- Jack and jack stands (if needed)
Make sure you have the right filter. The 3.6L V6 uses a cartridge-style filter. The 5.7L and 6.4L V8 use a spin-on filter. Check your owner’s manual or ask at an auto parts store.
Draining The Old Oil
- Warm up the engine for a few minutes. Warm oil drains faster.
- Park on level ground and engage the parking brake.
- If needed, jack up the front of the vehicle and place on jack stands.
- Locate the drain plug under the engine oil pan.
- Place the drain pan underneath.
- Loosen the drain plug with a socket wrench. Turn counterclockwise.
- Remove the plug by hand and let the oil drain completely.
- Clean the drain plug and replace the washer if needed.
- Reinstall the drain plug and tighten to 20-25 ft-lbs.
Be careful not to overtighten the drain plug. It can strip the threads or crack the oil pan. Hand-tighten plus a quarter turn is usually enough.
Replacing The Oil Filter
For the 3.6L V6, the filter is a cartridge inside a housing. Use a filter wrench to remove the housing cap. Pull out the old cartridge and o-rings. Install the new cartridge and o-rings, then tighten the cap to spec.
For the 5.7L and 6.4L V8, the spin-on filter is on the side of the engine. Unscrew it counterclockwise. Before installing the new filter, apply a thin layer of oil to the gasket. Screw it on hand-tight, then give it another three-quarters turn.
Always check the old filter’s gasket didn’t stick to the engine. Two gaskets can cause a leak and oil loss.
Adding New Oil
- Locate the oil fill cap on top of the engine. It’s usually marked with an oil can symbol.
- Remove the cap and insert a funnel.
- Pour in the correct amount of oil. For the 3.6L V6, add 6 quarts. For V8 engines, add 7 quarts.
- Replace the oil fill cap tightly.
- Start the engine and let it run for 30 seconds. Check for leaks around the drain plug and filter.
- Turn off the engine and wait 5 minutes.
- Check the oil level on the dipstick. Add more if needed to reach the full mark.
Don’t be alarmed if the oil pressure light stays on for a few seconds after startup. It takes a moment for oil to circulate. If it stays on longer, turn off the engine and check for issues.
Common Mistakes To Avoid
Many DIY oil changes go wrong because of simple errors. Here are the most common ones with the 2018 Grand Cherokee.
- Using the wrong oil weight: Always use 5W-20 unless your manual says otherwise.
- Overfilling: Too much oil can cause foaming and engine damage.
- Underfilling: Not enough oil leads to poor lubrication and overheating.
- Forgetting the drain plug washer: A worn washer can cause a slow leak.
- Not pre-lubing the filter gasket: This helps the filter seal properly.
- Overtightening the drain plug: This can strip threads or crack the pan.
Take your time and double-check each step. A rushed oil change can cost you more in repairs later.
How Often To Change Oil In A 2018 Jeep Grand Cherokee
Jeep recommends changing the oil every 6,000 to 8,000 miles for normal driving. If you drive in severe conditions—like towing, off-roading, or extreme temperatures—change it every 4,000 to 5,000 miles.
The oil life monitoring system in your Grand Cherokee will alert you when it’s time. But don’t rely solely on that. Check the oil level and condition regularly.
Full synthetic oil lasts longer than conventional, but it’s not immune to contamination. Stick to the schedule for best engine health.
Signs You Need An Oil Change Sooner
- Oil looks dark or gritty on the dipstick
- Engine sounds louder or rougher than usual
- Oil change warning light comes on
- You notice a burning oil smell
- Exhaust smoke is blue or gray
If you experience any of these, change the oil immediately. Ignoring them can lead to costly engine damage.
Frequently Asked Questions
What Happens If I Put Too Much Oil In My 2018 Jeep Grand Cherokee?
Overfilling can cause foaming, which reduces lubrication. It can also put pressure on seals and gaskets, leading to leaks. In severe cases, it can damage the engine. Always check the level after adding oil.
Can I Use Conventional Oil Instead Of Synthetic?
Yes, but it’s not recommended. The 2018 Grand Cherokee is designed for synthetic oil. Conventional oil may not provide adequate protection, especially in extreme temperatures. Stick with synthetic for best performance.
How Do I Reset The Oil Change Light After An Oil Change?
Turn the ignition to the ON position without starting the engine. Press the gas pedal three times slowly within 10 seconds. The light should flash and then turn off. If it doesn’t, consult your owner’s manual.
Does The 2018 Jeep Grand Cherokee Have An Oil Filter That Needs To Be Replaced Every Time?
Yes, always replace the oil filter with every oil change. A dirty filter can restrict oil flow and reduce engine protection. It’s a small cost for peace of mind.
What Tools Do I Need For A DIY Oil Change On A 2018 Grand Cherokee?
You’ll need a socket set (13mm or 15mm for drain plug), an oil filter wrench, a drain pan, a funnel, gloves, and rags. A jack and jack stands are helpful if the vehicle sits low.
Final Tips For Maintaining Your 2018 Jeep Grand Cherokee
Regular oil changes are the single most important maintenance task for your Grand Cherokee. They keep the engine clean, lubricated, and running efficiently. Don’t skip them or delay them.
Keep a log of your oil changes. Note the date, mileage, oil type, and filter used. This helps you track intervals and is useful if you sell the vehicle.
If you’re unsure about any step, consult a professional mechanic. A botched oil change can cause expensive damage. But with the right information, you can do it yourself confidently.
Remember the key numbers: 6 quarts for the 3.6L V6, 7 quarts for the 5.7L and 6.4L V8. Use 5W-20 full synthetic oil. Change it every 6,000 to 8,000 miles. Your Grand Cherokee will thank you with years of reliable service.