At Off-Road Handbook, our unwavering dedication to content quality is evident. Prior to publication, each piece of information undergoes a meticulous editorial process, which not only guarantees accuracy but also elevates the overall user experience.

Jeep 4.0 Oil Capacity and Type- All You Need to Know

The Jeep 4.0 engine is renowned for its robustness, reliability, and power. With its vast range of features, it’s no wonder the 4.0 has become the go-to engine for off-roaders and adventurers. However, many owners may be unaware of the oil type and capacity they should use to ensure their Jeep’s engine remains at its peak performance.

Jeep 4.0 engine requires fully synthetic oil with viscosity grades 5W-20 or 5W-30. Brands can vary, but the oil must meet viscosity standards. The oil chamber maximum capacity of the jeep 4.0 is 6 quarts.

In this article, I will provide you with the essential information you need to know to keep your Jeep 4.0 running smoothly.

The Jeep 4.0 Engine Type:

The Jeep 4.0 is an incredibly reliable and powerful engine found in many Jeep models throughout the years.

The 4.0L engine in Jeep is a 6-cylinder powerplant with a displacement of 4.0 liters (241.6 cubic inches). It features a 3.8-inch bore and 3.41-inch stroke and is equipped with 12 overhead valves. The engine boasts a compression ratio of 8.8:1 and delivers 190 horsepower at 4600 RPMs and 235 lb-ft of torque.

The ‘4.0’ refers to the engine’s displacement, not its total oil capacity. This engine has a maximum oil capacity of 6 quarts.

What Kind of Oil Does a Jeep 4.0 Take?

The Jeep 4.0 engine needs a fully-synthetic engine oil with a viscosity of 5W-20 or 5W-30.

Synthetic oils are designed to provide better lubrication and protection for the engine than conventional motor oils. This is important for older engines, as synthetic oil can help prevent wear and tear. 

When Should the Oil of a Jeep 4.0 be Changed?

When it comes to maintaining the health of the engine, it is essential to consider when to change the oil of a Jeep 4.0. The engine oil of a Jeep 4.0 should be changed every 6 months or every 3,500-5,000 miles, whichever comes first.

When choosing the engine oil for a Jeep 4.0, it is essential to note that it should have been manufactured no more than 3 years ago. This is because the oil's shelf life is around three years, so any oil on the shelves for longer than three years could potentially harm the engine's health.

To ensure that your Jeep 4.0 has a long and healthy life, paying close attention to when the engine oil should be changed is essential. Regular oil changes can help extend your vehicle’s life and prevent any unnecessary engine damage.

Always check the oil level regularly and top it up if necessary. If you need help checking the oil level, you can refer to the vehicle’s owner’s manual for more information. Additionally, many helpful videos online can walk you through the process.

If you’re looking to save money in the long run, it is essential to make sure that you take the time to change the oil of your Jeep 4.0. This can help extend your Jeep’s life and prevent costly engine damage.

How to Check the Oil Level in Jeep 4.0:

Here’s how you can check the oil level and determine the frequency of oil changes for a Jeep 4.0 engine:

  • STEP 1: Park the Jeep on level ground and turn off the engine.
  • STEP 2: Locate the oil dipstick under the hood and remove it.
  • STEP 3: Clean the dipstick and reinsert it.
  • STEP 4: Remove the dipstick again.
  • STEP 5: Check the oil level. The oil should be between the “Low” and “Full” marks on the dipstick.
  • STEP 6: If the oil level is low, add oil as necessary and repeat the process until the level is between the marks.

Indicators that Show the Oil of a Jeep 4.0 Needs to Get Changed:

Whenever a vehicle runs for a long time, and the engine oil has not been changed, several indicators would timely warn the owner that the oil needs to get changed.

Below are some factors which indicate that the oil of the vehicle should be changed, or else it would cause harm to the health of the engine of the vehicle.



Change of color

When on inspection, the color of the oil changes from a standard oil color, which is light brown, to dark brown or black, which means that the oil has completed its life span and needs to be changed.

Decrease in viscosity

Upon inspection, if the oil feels less thick or less viscous, it also is considered an indicator that the oil has now completed its life and should be changed as soon as possible.

Noisy engine

When the oil becomes old, it gets less viscous and produces more friction between the engine parts. As a result of the friction, the engine parts start making abnormal noises, and it becomes evident that the vehicle's oil should be changed.

Burning odor

When the oil becomes old, the engine starts burning the oil more often, which results in an unpleasant odor. This also indicates that the oil has now completed its life and should be changed soon.

How to Change the Oil and Oil Filter of a Jeep 4.0:

It is easy to change the oil and oil filter of a jeep 4.0 if you have the essential tools and instruments. The job barely takes 20 minutes, and you can do it at home quite easily without the help of a mechanic or a car technician. 

Changing the engine oil and oil filter of a jeep 4.0 can be done in the following simple and basic steps. However, it should be kept in mind that the vehicle manufacturer recommends only synthetic oil.

  • STEP 1: The car’s engine should be started and left on for 10-15 minutes so the engine oil can reach its actual temperature.
  •  STEP 2: Once the primary oil temperature is reached, the car should be switched off.
  •  STEP 3: After opening the hood, the oil cap is to be located and removed.
  •  STEP 4: After that, the oil drain cap has to be removed, and as soon as the drain cap comes off, the old oil will start draining immediately.
  •  STEP 5: Once the oil is drained, the old oil filter should be removed by a wrench and replaced by the new oil filter.
  •  STEP 6: After replacing the oil filter, the drain bolt should be placed back and sealed completely.
  •  STEP 7: Now, the new engine oil is to be poured into the engine.
  •  STEP 8: After pouring the engine oil, it is essential to check the oil level in the chamber with the measuring stick present in the engine.

These are the easy steps to change the engine oil and filter of a jeep 4.0.

It is essential to make sure that while pouring the engine oil, the chamber must be filled precisely, neither less nor more, because both situations could damage the head of the engine. 

The amount of engine oil to be poured is 6 quarts, as recommended by the manufacturer.

Oil Capacity of Different Models of Jeep:

Model of Jeep


Oil Capacity

Jeep Cherokee XJ 4.0L


5.5 quarts with filter included

Jeep Cherokee XJ 4.0L


6 quarts with filter included

Jeep Wrangler YJ


6 quarts with filter included

Jeep Grand Cherokee ZJ 4.0L


6 quarts with filter included

Jeep Wrangler TJ


6 quarts with filter included

Jeep Grand Cherokee WJ 4.0L


6 quarts with filter included

Jeep Wrangler TJ


6 quarts with filter included

Jeep Wrangler Model Year

Oil Type

Oil capacity


10W-30 or 5W-30

6 quarts


10W-30 or 5W-30

6 quarts



6 quarts



5 quarts

Best Oil Companies for Jeep 4.0:

When it comes to oil, a variety of companies offer different products. Naturally, some will be more expensive, but the best oil for your Jeep 4.0 is a fully synthetic oil with a viscosity of 5W-20 and 5W-30.

Those oil brands are listed below:

  • Castrol
  • Valvoline
  • Pennzoil

The good news is that all these oils are considered of almost equal quality, fully synthetic, and of the same viscosity recommended by the manufacturer. So you can rest assured that whichever oil you choose, you’ll give your engine the best protection.

These oils are also known as high mileage oils, which means they help recondition the engine’s seals over time and mileage. This can help extend your engine’s life and prevent damage from occurring due to wear and tear.

1. Castrol Edge Full Synthetic Oil:

Jeep 4.0 Oil Type and Capacity

Castrol Edge full synthetic oil is designed to provide superior protection and performance for your vehicle in many conditions. Whether you’re driving in extremely cold or hot weather, Castrol Edge can keep your engine running smoothly and minimize wear and tear.

By using Castrol Edge full synthetic oil, you’ll be able to take advantage of several benefits. It provides superior lubrication and helps reduce friction within the engine, which will help to extend its life.

The oil is also designed to help keep your engine clean and minimize the buildup of sludge, which can cause engine problems.

2. Valvoline High Mileage Oil:

Jeep 4.0 Oil Type and Capacity
Valvoline High Mileage with MaxLife Technology Motor Oil is specifically designed to help extend the life of vehicles that have exceeded ~12700 km (75,000 miles).

Valvoline High Mileage Oil is formulated with anti-wear additives to defend your engine’s components and reduce heat and abrasion.

It also includes advanced detergents that clean the inside of your engine to keep it running smoothly.

3. Pennzoil Platinum Synthetic Motor Oil:

Jeep 4.0 Oil Type and Capacity

Made with Pennzoil’s patented PurePlus Technology, this engine oil is made from natural gas, not crude. This means it’s carbon neutral, offsetting the CO2 lifecycle emissions with verified Nature Based Carbon Credits.

Using Pennzoil Platinum Synthetic Motor Oil for your 4.0 will provide better fuel economy, helping you drive an average of 550 miles more per year with a cleaner engine than with traditional motor oil.

The Oil also offers superior protection for your 4.0. Based on Sequence IIIH results, it can keep pistons up to 45% cleaner than the industry standard. That means a better functioning engine and improved performance on the road.

In addition, Pennzoil Platinum Synthetic Motor Oil is engineered to resist breakdowns and chemical and thermal breakdowns. This helps your engine run more smoothly and efficiently while reducing friction and wear on components.

So, if you’re looking for motor oil to keep your 4.0 running like new, Pennzoil Platinum Synthetic Motor Oil is the ideal choice. It provides superior protection, fuel economy, and performance – giving you the best value for your money.

Why is It Necessary to Maintain the Oil Capacity in the Jeep 4.0 Engines?

Maintaining oil levels and changing it regularly in the Jeep 4.0 engines is of utmost necessity as it helps keep the engine running smoothly. Keeping the oil at its optimal level ensures that the engine runs at peak performance and minimizes the chances of wear and tear on the engine components.

The oil in your engine acts as a lubricant, helping to reduce friction between the components and reducing wear and tear on the parts.

However, as the oil becomes used over time, it becomes less effective as a lubricant, leading to increased engine wear and decreased performance. Therefore, it is essential to maintain the oil level in your engine and to change it regularly.

Using the correct type of oil for your engine can also help prolong its longevity. Different oils are designed to lubricate various engine components, and using the wrong oil can lead to damage. Furthermore, using old or dirty oil can clog up the engine with debris, reducing performance and leading to damage.

It’s essential to check the oil levels regularly in your engine, as low levels can cause the engine to overheat, leading to further damage. Furthermore, checking for leaks in the oil system is essential, as a lack of oil can cause severe engine damage.

Final Thought:

Owning a Jeep 4.0 requires paying attention to the oil type and capacity needed for your engine. Knowing the type and amount of oil necessary for your Jeep can help you avoid getting stuck in the middle of nowhere.

Not only is it essential for performance, but it is also essential for the longevity of your engine. So follow the recommended oil type and capacity to ensure safe and enjoyable drives.

Also Read:

Jeep Touch Screen Not Working-How to Fix?
Why is Your Jeep Wrangler’s Vehicle Security Light Flashing?
Jeep 2.0 Turbo: Common Problems to Watch Out For
Why Are Jeep ABS and Traction Control Lights On? How to Fix
Why Jeep Grand Cherokee USB Port Not Working-How To Fix
Why Do Jeep Patriot ABS and Traction Control Lights ON (Fix)

Frequently Asked Questions (FAQs):

Is oil with a grade of 10W-30 considered a better option than 5W-30?

The higher viscosity of oil results in increased drag and extreme vehicle temperature. This scenario is because high-viscosity oil is ineffective in transferring heat along with the oil viscosity oil. Therefore, low-viscosity oils, also known as thinner oil, are highly recommended for the engine.

It makes the oil flow quickly during the movement of the vehicle. The internal parts of the engine might get contact with each other which results in wear and tear of the engine due to the presence of friction. The excellent quality of motor oil provides maximum fuel economy, efficient consumption of oil, and protects the engine.

What would happen if a person puts a 10W-30 in a jeep 4.0 instead of a 5W-30?

10w30 is a thick oil, while 5w30 is a thin oil in viscosity. 5w30 is used in cold temperate regions because the engine must start in cold weather. On the other hand, 10w30 is a thick oil that performs better in engines used in hot conditions.

If you start using the 10w30 thick oil in vehicles that hold the capacity of bearing thin oils, then oil will not flow properly in such vehicles. It can lead to wear and tear of the engine as oil will not lubricate and can damage the engine. 

Can you use thick oil in jeep 4.0?

No, a jeep 4.0 isn’t recommended with thicker oil. It means that if the oil that is very thick in viscosity is poured into a jeep 4.0, it might cause damage to the heads of the engine and eventually result in damage to the crankshaft.

Which type of oil is used in the Jeep 4.0?

Full synthetic oil of 5W-20 or 5W-30 rating works best for the Jeep 4.0 engine. There are also some other brands too that work best for the Jeep 4.0.

Which type of oil is best for the Jeep Grand Cherokee 4.0 engine?

The 10W-30 grade synthetic motor oil goes best for the Jeep Grand Cherokee has a 4.0L engine. It helps this vehicle to work correctly and is according to the type of engine.

How much oil can the TJ 4.0 hold?

TJ 4.0 can hold up to 6 quarts of oil in one go.

Which type of oil is recommended for the Jeep Grand Cherokee?

A 3.6-liter V6 engine and a 5.7-liter Hemi V8 engine are seen in the Jeep Grand Cherokee vehicle. These engines use the 0W-20 synthetic oil, which goes best for such engines.

How many miles can the Jeep 4.0 engine cover?

The jeep 4.0 engine can run well over 250K miles. It is easy to work and maintain this type of engine.