Jeep 4.0 Oil Type and Capacity (Explained)

The Jeep brand is known for producing reliable automobiles, and has established itself as one of the most reputable manufacturers of SUVs on the market today. They have never failed to offer us the best driving experience while still guaranteeing that we have a nice rugged appearance.

Despite how outstanding they are, the Jeep’s oil efficiency has been called into doubt on numerous occasions. This is why you need to know how to determine your Jeep engine’s 4.0 oil capacity.

Realizing this will not only help you put the correct amount of oil in your vehicle, but it will also help you avoid overfilling, sparing your engine from damage sooner than expected.


How to determine the Jeep 4.0 Oil Capacity

The majority of the 4.0-liter engines used in Jeep SUVs will require up to 6 quarts of oil during filling. In the United States, 6 quarts is equivalent to 1.5 gallons (or 5.7 liters) of oil. You will find that the oil capacity of your engine is 5 quarts and that most repair manuals will advise you not to use more than that oil amount in your vehicle’s engine.

When changing the oil filter and the engine oil, you must not forget to fill the engine oil to the top of the oil dipstick. This is something that you should always keep in mind.

If you did this, your oil tank would be filled to approximately 5.5 quarts on average. However, the amount of oil required might be anywhere from 5 to 6 quarts, depending on several other parameters, such as the oil filter.

Make sure to keep in mind that a dry engine typically arrives with a fill level of 6 gallons. It could be after a rebuild, for example. If you are conducting the maintenance on your own, you must always reset the oil service light on your Jeep.

Reset the oil light after an oil change, or simply reset the check engine light.

Turn off any service reminder warning lights that show on your Jeep.

What Type of Oil Does a 4.0 Jeep Engine need?

Jeeps are the kind of vehicle that, provided you know how to properly care for it, will serve you for a lifetime.

Many people overlook this, but choosing the right motor oil for your Jeep is one of the most important decisions you can make to keep the engine healthy.

In 1986, Jeep debuted its 4.0-liter engine. Off-road drivers tested this engine, and it came out as one of the best options available.

Not only that, this engine has been utilized in practically every single model of Jeep that has ever been produced, including the Cherokee and the Wrangler.

The six-cylinder engine can last up to a maximum of 200,000 miles without substantial overhauls or issues, and it is one of those engines that are use in sophisticated automobiles.

Numerous engine oils on the market claim to be the finest for your 4.0 engine. However, to keep your Jeep in good working order, I have compiled a list of some of the best oils for your Jeep 4.0 engine below.

  • Pennzoil Platinum Full Synthetic
  • Castrol Edge Advanced Full Synthetic
  • Royal Purple High-Performance Synthetic
  • Valvoline Full Synthetic Advanced
  • Mobil 1 High Mileage Full Synthetic

These are some of the best 4.0 engine motor oils you can use to ensure that your Jeep stays healthy and in good condition for a long time.

How Much Oil Does a Jeep 4.0 Engine Take?

As previously stated, a 4.0 engine Jeep requires about 6 quarts of oil to fill.

Most Jeeps require 5.5 quarts of oil, but depending on the type of oil filter you have and other considerations, your Jeep may only require 5 quarts.

The 6 quarts of oil are often reserved for automobile engines that have almost entirely lost their lubrication. In the United States, a quart of oil is roughly 1.5 gallons which is equivalent to 5.7 liters.

According to the manufacturer’s recommendations, your Jeep could need motor oil with a viscosity of about 5W to 30W.

The amount of oil that can be stored in the oil box of a manual gearbox is 0.4–1.5 gallons. The amount of oil included in an automatic gearbox would be 3.8-1 gallon US or 4.02 quarts US, respectively.

Jeep 4.0 Different Model Oil Capacity

To be more specific, the oil capacity of a 4.0-liter Jeep engine would be about 6 quarts or even 6.2. It would be equivalent to 1.5 US gallons or 5.7 liters.

To further assist you, the following chart provides a breakdown of the various models and years of Jeeps, as well as the oil capacity, viscosity, and torque.






Oil Capacity





Jeep Cherokee XJ 4.0L 1987 – 1990 5.5 quarts (filer included) 10W – 30, 10W – 40, 20W – 40, 20W to 50 30 ft/lbs.
Jeep Cherokee XJ 4.0L 1991 – 1999 6 quarts (filter included) 10W – 30 5W – 30 30 ft/lbs.
Jeep Wrangler YJ 1991 – 1995 6 quarts (filter included) 10W – 30 5W – 30 30 ft/lbs.
Jeep Grand Cherokee ZJ 4.0L 1993 – 1998 6 quarts (filter included) 10W – 30 5W – 30 30 ft/lbs.
Jeep Wrangler TJ/LJ 1997- 1999 6 quarts (filter included) 10W – 30 5W – 30 25 ft/lbs.
Jeep Grand Cherokee WJ 4.0L 1999 –2004 6 quarts (filter included) 10W – 30 5W – 30 25 ft/lbs.
Jeep Cherokee XJ 4.0L 2000-2001 6 quarts (filter included) 10W – 30 5W – 30 25 ft/lbs.
Jeep Wrangler TJ/LJ 2000 – 2006 6 quarts (filter included) 10W – 30 5W – 30 25 ft/lbs.

Why is Oil Maintenance Important for Your Jeep 4.0 Engine?

As you continually run your engine, it will keep on accumulating dirt and particles. Simply changing your oil can eliminate or even significantly cut the amount of unwanted dirt in your vehicle. The accumulation of sludge is another problem that frequently happens to vehicles.

Changing your oil regularly will help you eliminate dirt buildup and keep your engine at maximum efficiency. It also prevents the engine from overheating. This is why you must perform routine oil maintenance on your 4.0-liter Jeep engine to protect it from wear and tear or damage.


Jeeps are safe and dependable vehicles. They are an excellent alternative if you want to spend time with your family on an outing away from city streets and toward harsh terrains. You don’t want to be stranded in the middle of nowhere because you didn’t supply enough oil.

This is why, if you possess a Jeep 4.0, you need to know its oil capacity. Always ensure that you have sufficient oil before going on trips.  Drive safely!