The Jeep 4.0 engine is powerful and reliable. However, you’ll need to make the proper oil changes to ensure it continues to run efficiently and smoothly. For you to do that, you need to know how to find the Jeep 4.0 oil capacity, how many quarts it takes, what kind of oil it takes, and much more.
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How to Find the Jeep Cherokee 4.0 Oil Capacity?
The Jeep 4.0-liter six-cylinder engine or simply Jeep 4.0 is well-built. You might think that the 4.0-liter reference above means the engine has an oil capacity of 4 liters. Well, what you need to know is that 4.0 simply refers to the engine’s displacement, not the total volume of oil.
The true oil capacity of the Jeep 4.0 engine is 6.02 quarts US or 1.51 gallons US or 5.7 liters. You can find this information in the owner’s manual. Simply pull the digital owner’s manual on your smartphone or tablet. Alternatively, you can dig a hard copy of the owner’s manual from your glovebox or garage and look up the information in the index.
You can always find a reference to your Jeep 4.0 oil capacity under the section devoted to routine maintenance.
Besides the owner’s manual, visit the manufacturer’s website, in this case, Jeep.com. Look for owner’s manuals, service manuals, or technical information sheets for your Jeep 4.0 engine. If unable to locate the owner’s manual page, contact the support team.
If you find the owner’s manual, under routine maintenance check and you’ll find the total oil capacity given both with and without a filter. The units will also be in quarts, imperial quarts, and liters.
If you want to know the oil level of your Jeep 4.0 engine, open the hood, locate the dipstick, and insert it into the tube slowly. Then push the dipstick all the way down. Now, withdraw the dipstick and look at it closely.
If the level of oil is between the two lines, then your Jeep has enough oil. However, if the oil is at the low mark or below, then you need to add a quart. Remember, allow your car to cool before you open the hood and pull out the oil dipstick.
What Kind of Oil Does a 4.0 Jeep Engine Take?
The type of oil your Jeep 4.0 uses is as important as the quantity of oil it needs. If you check your owner’s manual, you’ll learn that your Jeep 4.0 requires fully synthetic motor oil. The oil should have a viscosity of 5W-20 or 5W-30.
If you’re not familiar with the oil viscosity ratings, here is a quick overview.
(oil viscosity at 0 degrees F) W – (oil viscosity at 212 degrees F)
The first number next to the letter “W” describes the viscosity of the oil at a cold start. The second number describes the viscosity at normal operating temperature. So, if the oil has a viscosity of 5W -20, that means the oil has a rating of 5 at a cold start and a rating of 20 at normal operating temperature.
While it’s recommended to use fully synthetic oil with either 5W-20 or 5W-30 rating for your Jeep 4.0 engine, always go for the quality. Certain brands make better quality synthetic oil than others. So, before you buy, read the online reviews.
How Many Quarts of Oil Does a 4.0 Jeep Take?
The Jeep 4.0 we know and love was developed by AMC in 26 months with an improved combustion chamber, overall strength, and cam profile. Introduced in 1986 for 1987 models, the 242 cu engine was so beloved by Chrysler that they kept it when they merged with AMC in 1987.
After the merger, Chrysler made several refinements including reducing noise, harshness, and vibration. Since its introduction, Chrysler fitted the 4.0 engine in the following models:
- Jeep Cherokee: 1987 to 2001
- Jeep Comanche: 1987 to 1992
- Jeep Wagoneer: 1987 to 1990
- Jeep Wrangler: 1991 to 2006
- Jeep Grand Cherokee: 1993 to 2004
One reason why Jeep owners love this engine is that it has a long crankshaft that provides impressive torque. This makes the Jeep 4.0 perfect for overcoming off-road terrain and obstacles. Second, people love the 4.0 L engine because of its durability. It lasts 200,000 miles with minimal issues. Lastly, it’s super easy to find parts for the engine as the company produced millions of them.
To the dismay of Jeep 4.0 owners, Chrysler discontinued the 4.0 L engine in 2006. However, if you bought a Jeep 4.0 at an auction or your dad gave you one, the Jeep 4.0 engine takes 6.02 quarts of oil.
Jeep 4.0 Oil Capacity: How Much is It?
The table below contains a variety of Jeep models, their year of manufacture, their oil capacity, and viscosity.
| Jeep Model | Year of Manufacture | Oil Capacity | Viscosity |
| Cherokee XJ 4.0 L | 1987 to 1990 | 5.5 quarts with filter included | 10W-30, 10W-40, 20W-40 |
| Wrangler YJ 4.0 L | 1991 to 1995 | 6 quarts | 5W-30, 10W-30 |
| Cherokee XJ 4.0 L | 1991 to 1999 | 6 quarts | 5W-30, 10W-30 |
| Cherokee ZJ 4.0 L | 1993 to 1998 | 6 quarts | 5W-30, 10W-30 |
| Wrangler LJ/TJ | 1997 to 1999 | 6 quarts | 5W-30, 10W-30 |
| Cherokee WJ 4.0 L | 1999 to 2004 | 6 quarts | 5W-30, 10W-30 |
| Cherokee XJ 4.0 L | 2000 to 2001 | 6 quarts | 5W-30, 10W-30 |
| Wrangler LJ/TJ | 2000 to 2006 | 6 quarts | 5W-30, 10W-30 |
Why Oil Maintenance is Important for Your Jeep 4.0 Engine?
There are several reasons why oil maintenance is important. If you’re someone who has to drive long distances frequently, then you ought to know that gas mileage and the quality of oil go hand in hand. By making consistent oil changes, your Jeep 4.0 will maintain excellent gas mileage. If you fail to change your oil as required, it’s going to reduce your gas mileage. As such, you’ll have to spend more money to put in gas more often.
Changing your oil helps to extend the life of your 4.0 L engine. This provides you with more value and long service. Besides value, you help prevent sludge and dirt particles from your engine. It also prevents the occurrence of engine problems that leave you stuck on the road and unable to go about your daily activities.
Your engine will produce a lot of heat which is normal. What you don’t want is your engine overheating. Without proper oil changes, the likelihood of your engine overheating is high. This is because the old or dirty oil will be unable to pull heat from the engine cooling it. To avoid a wealth of problems and keep your jeep running efficiently, make the proper oil changes.
Frequently Asked Questions
1. How do I know if my Jeep needs an oil change?
The most obvious alert that your Jeeps need an oil change is the oil change light in your Jeep will illuminate. If this happens, check the dipstick.
2. How often should you get an oil change on a Jeep?
Experts recommend an oil change every 7500 to 10,000 miles. However, how frequently you get an oil change depends on your driving habits.
Final Words
Now that you know how to find the Jeep 4.0 oil capacity, the kind of oil your Jeep 4.0 takes and why oil maintenance is important, you can save a lot of money. How you may ask. Engine problems can lead to expensive repairs and replacement of parts. By maintaining the proper oil change, you save money on your Jeep and ensure it continues to run efficiently.