Jeep 4.0 Oil: Your Ultimate Guide to Type & Capacity

Over the years, Jeep has provided us with the best off-roading vehicles, from Cherokee Grand Cherokee to Wrangler. Jeep uses a 4.0L engine with reliability, ultimate performance, and power. With that being said, it has proven as one of the go-to options for off-roaders and traversers.

However, many Jeepers need more care and essential changeovers to maintain adequate performance of Jeep. Changing engine oil is one of the most effective hauls.

To let you know, Jeep 4.0 uses 6 quarts of engine oil with a viscosity grade of 5W-20 or 5W-30.

This article will walk you through all the details regarding a Jeep 4.0 oil type and capacity.

What is Jeep 4.0?

‘Jeep 4.0’ refers to an engine of 6 cylinders with a total displacement of 4.0L. It consists of 12 overhead valves with a 3.8-inch bore and 3.41-inch stroke featuring a compression ratio of 8:8:1. 

4.0 Jeep engine is powerful and delivers 190 hp at 4600 RPM.   

As it is called a 4.0 engine, the oil pan capacity is 4 liters. However, it denotes the engine displacement. While the oil capacity to be maintained for this engine type is 6 quarts.

What kind of oil does 4.0 Jeep Grand Cherokee and other models take?

Jeep Model	Year	Oil Capacity	Viscosity
Jeep Cherokee XJ 4.0 L	1987 – 1990	5.5 quarts	10W – 3010W – 4020W – 4020W – 50
Jeep Cherokee XJ 4.0 L	1991-1999	6 quarts	10W-305W-30
Jeep Grand Cherokee ZJ 4.0 L	1993 – 1998	6 quarts	10W-305W-30
Jeep Grand Cherokee WJ 4.0 L	1999-2004	6 quarts	10W-305W-30
Jeep Wrangler YJ	1991 – 1995	6 quarts	10W-305W-30
Jeep Wrangler TJ/LJ	2000 – 2006	6 quarts	10W-305W-30
Jeep Wrangler TJ	2006 – 2018	6 quarts	5W – 20
Jeep Wrangler TJ	2018 – present	5 quarts	0W – 20

How much oil does a Jeep 4.0 take?

Jeep Cherokee 4.0 has an oil capacity ranging from 5.5 to 6 quarts. Similarly, other models like Wrangler and Grand Cherokee caters to oil level between 5 to 6 quarts.

5 quarts is 4.7 liters, 5.5 quarts is 5.2 liters, and quarts are measured in 5.6 liters. It depends on the manufacturer’s manual how much oil your model of a Jeep 4.0 take, but usually, it ranges from 5 to 6 quarts.

While changing your engine oil, make sure that you fill it up with the mark given on the dipstick. You might not have to fill the oil pan to a brimming level as some oil is still in the pan even when it shows low-level.

Moreover, you might have to fill it to the highest level when a completely dry pan is filled out.

How to change the Jeep 4.0 oil filter and oil?

Changing your engine oil is quite simple and a complete DIY task. You can do it by yourself by following these easy-peasy steps.

Tools you will need:

• Socket wrench
• Filter wrench
• New oil filter
• Manufacturers recommended fresh engine oil
• Sealable contained old oil

Steps to follow:

• Switch on your ignition and keep it running for 15 minutes so your engine oil attains running a temperature.
• Turn off the engine and open your Jeep’s hood.
• Locate the engine oil reservoir and remove its lid.
• Now locate and open the oil drain bolt. Drain the old oil in the drain pan.
• Use the filter wrench to unscrew the old oil filter.
• Now replace the new oil filter once the old oil is completely drained out.
• Then replace the drain bolt.
• Now fill the fresh engine oil viscosity 5W-20 or 5W-30 according to the suggested level by the manufacturer.

After following all these steps, check your dipstick to reconfirm the oil level. After that, switch on your ignition and make sure your engine runs smoothly.

Best oil brands for a Jeep 4.0L

While choosing an oil, you must consider a few things, including using a reliable brand, using the manufacturer’s suggested motor oil, and tweaking the oil recommendation according to the temperature and humidity of your area of residence.

However, the suggested brands are reliable and deliver the best product regarding viscosity and engine performance.

• Valvoline full synthetic advanced
• Castrol edge advanced 
• Pennzoil platinum
• Mobil 1 high mileage
• Royal purple high-performance

How frequently must you change the oil in a 4.0 Jeep engine?

Oil change and servicing your Jeep improves its overall performance; therefore, we recommend you change your engine oil every 3.000 to 5,000 miles.

If you are a long-route driver, then this frequency may lead up to 6 months. But checking the condition of the oil every month is a must.

If you observe any issues mentioned below while checking your oil, you should change them immediately.

• Burning smell from your oil.
• Presence of residues in your oil.
• Color change into brown or black
• If the oil feels rough with suspended particles.
• If the engine starts making a strange noise.
• If the engine begins stalling/jerking.

Final thoughts

Modifying a Jeep and doing a wave sign are not only the prerequisites of keeping a Jeep. You must be proactive in its maintenance and service to deliver your ownership with your efforts too.

Show your Jeep some love with a fresh engine oil and filter change – it’s the most fundamental way to honor your ownership. Don’t put it off; embracing this simple maintenance task will unlock your engine’s full potential and keep you cruising confidently, far from the frustration of a roadside breakdown.

Use this guide as a manual for planning your next oil changeovers. Till next time enjoy a safe ride!