Jeep 4.0 Oil Type and Capacity

The Jeep 4.0 engine is a reliable and durable engine. This engine is known for its high torque output, fuel efficiency, and low emissions. The Jeep 4.0 engine is a popular choice for Jeep enthusiasts and off-roaders.

In this article, we will talk about the Jeep 4.0 engine oil type and capacity. We will also talk about the recommended oil change interval for this engine.

Jepp 4.0 Engine – In a Nutshell

The Jeep 4.0 engine was introduced in 1987, and it was used in a variety of Jeep vehicles until 2006. This engine is also known as the Chrysler PowerTech engine. The Jeep 4.0 engine has a displacement of 3,969 ccs (4.0 L) and it is a V6 engine. The bore and stroke of this engine are 3.875 in (98.4 mm) and 3.41 in (86.6 mm), respectively. The compression ratio of the Jeep 4.0 engine is 8.5:1.

The Jeep 4.0 engine has a cast-iron block and heads, with aluminum-alloy pistons. The connecting rods and crankshaft of this engine are also made from cast iron. The Jeep 4.0 engine is a pushrod engine, with two valves per cylinder. The intake and exhaust valves are actuated by rocker arms, which are operated by pushrods.

The Jeep 4.0 engine is equipped with a carburetor, but it can also be equipped with fuel injection. The carbureted version of this engine produces 150 hp (112 kW) at 4,600 rpm and 240 lb-ft (325 N⋅m) of torque at 3,200 rpm. The fuel-injected version of this engine produces 190 hp (142 kW) at 5,200 rpm and 235 lb-ft (319 N⋅m) of torque at 3,600 rpm.

The Jeep 4.0 engine is mated to a three-speed automatic transmission or a five-speed manual transmission. The three-speed automatic transmission has ratios of 2.74:1, 1.54:1, and 1.00:1. The five-speed manual transmission has ratios of 3.58:1, 2.19:1, 1.38:1, 1.00:1, and 0.83:1.

Jeep 4.0 Oil Capacity

The Jeep 4.0 engine is equipped with a cooling system that consists of a water pump, radiator, thermostat, and fan. The cooling system has a capacity of 4.5 quarts (4.2 L).

The Jeep 4.0 engine requires oil that has a viscosity of 10W-30 or 5W-30. The oil capacity of this engine is 6 quarts (5.7 L).

When you replace the oil filter and engine oils, just pour enough liquid over your dipstick so that it reaches all of the ways to the bottom. This will generally fill up with 5-6 quarts worth if there are no other factors involved in how much this process takes out or puts back into a vehicle’s systems

The recommended oil change interval for the Jeep 4.0 engine is 7,500 miles (12,000 km) or 6 months, whichever comes first.

The Jeep 4.0 engine has a timing chain that does not require maintenance or replacement. The recommended spark plug for this engine is the NGK BPR6ES.

The Jeep 4.0 engine has a service life of 150,000 miles (240,000 km).

Best oil for a 4.0 Jeep Engine

There are a few different types of oil that can be used in a 4.0 Jeep engine, but the most common type is 5W-30. This oil is typically used in vehicles that operate in cold weather conditions, as it has a lower viscosity and thus flows more easily through the engine at lower temperatures.

Other types of oil that can be used include 10W-30 and 15W-40, but these are not as common. It is important to consult your owner’s manual or a qualified mechanic to determine the best type of oil for your particular engine and driving conditions. But we have done that already and found some of the best engines oil for your 4.0 Jeep engine:

Castrol Edge Advanced Full Synthetic

This oil is designed to provide superior protection and performance in a wide range of conditions, including extreme cold and heat. It is also designed to minimize wear and tear on your engine, helping it to last longer.

Valvoline Fully Synthetic High Mileage Motor Oil

This oil is designed for vehicles with over 75,000 miles on them. It helps to reduce leaks and oil consumption, while also providing superior protection against wear and tear.

Pennzoil Platinum Full Synthetic 10W-30 Motor Oil

This is a great oil for those who live in cold climates. It flows easily and helps to keep your engine running smoothly, even in the coldest temperatures. The only downside is that it is a bit on the expensive side.

Royal Purple 51530

Royal Purple’s Motor Oil is a synthetic motor oil that provides superior protection and improves performance in gasoline and diesel engines. It also helps improve fuel economy and reduces emissions. It’s compatible with all types of engines, including those turbochargers and superchargers.

Why Oil Maintenance is Important for Your Jeep 4.0 Engine?

Maintaining proper oil levels and changing your oil on a regular basis are important for the longevity of your Jeep 4.0 engine. Fresh, clean oil lubricates your engine parts and helps to remove dirt, debris, and other contaminants.

Over time, oil breaks down and becomes less effective at lubricating your engine and removing debris. This can lead to increased wear on your engine parts and reduced performance.

To keep your Jeep 4.0 engine running strong, it is important to change your oil regularly and use the correct oil for your engine.

Also, be sure to check your oil levels regularly. If your oil level gets too low, it can damage your engine.


The Jeep 4.0 engine is a workhorse of a motor, and it’s no surprise that many Jeep owners are curious about the oil type and capacity of this engine. While the recommended oil type and capacity can vary depending on the year and model of your Jeep 4.0 engine, in general, most models will take between 6-8 quarts of oil.

The recommended oil type for Jeep 4.0 engines is typically a 10W-30 or 5W-30 weight motor oil. However, it’s always best to check your owner’s manual or with a Jeep dealer to be sure.

Regardless of the type or quantity of oil, your Jeep 4.0 engine takes, keeping it well-maintained is key to keeping it running strong for years to come.