Best Oil for Jeep 4.0 Engine: Especially For High Miles

Why Get The Top Rated Engine Oil for Jeep 4.0 Engine?

The Jeep 4.0 engine debuted in 1986, while the brand was still a subsidiary of the American Motor Corporation (AMC). It is regarded as one of the best off-road engines and has been used in nearly every Jeep model, including the Jeep Wrangler and Jeep Grand Cherokee.

It’s a six-cylinder engine with a capacity of about 242 cu. It’s one of those engines that can go up to 200,000 miles between overhauls.

Jeep is a sturdy vehicle that, if properly maintained, may last a lifetime. Finding a suitable motor oil is one of the most important decisions you’ll make for your Jeep.

In this guide, we will discuss which is the best oil for the Jeep 4.0 engine on the market.

Jeep 4.0 Engine Oil Types

As far as oil type is concerned, Jeep makes no precise suggestions. Given the age of the engine, it works well with both conventional and synthetic fuels. It all comes down to personal preference, so choose whatever one you want.

It makes no difference what automobile model or year you have. The oil type for a 2004 Jeep Wrangler 4.0 and a 2005 Jeep Wrangler would be essentially the same.

Jeep Wrangler Motor Oil

Engine oil change on a 2012-2018 Jeep Wrangler is not the hard task that many people believe, nor is it what auto dealers and car dealerships around the country advertise. Jeep lovers of all skill levels can easily complete this project. Furthermore, many do when the moment is appropriate.

All you need are a few basic tools and possibly a couple jack stands, depending on whether the car is stock or elevated, and you can finish the project without spending a day in a waiting room with stale coffee.

The recommended oil for the Jeep Wrangler is a 5W-20.

Jeep Grand Cherokee Motor Oil

Engine oil with a viscosity of 0W-20 that meets Chrysler MS-6395 quality criteria is suggested for 2015 Jeep Cherokee vehicles with 4-cylinder engines. Engine oil with a viscosity of 5W-20 that fulfills Chrysler MS-6395 quality criteria is suggested for 6-cylinder vehicles.

The recommended oil for Jeep Grand Cherokee is 6 U.S. quarts of SAE 10w30 motor oil. In colder climates, 5w30 may be used.

Best Oil for Jeep 4.0 Engine: Must Have If It Has High Miles

1. Castrol Edge 10W-30 Advanced Full Synthetic

For quite some time, Castrol has been producing high-quality goods, and they never fail to disappoint. Their oils are meant to keep the engine in top condition while also improving the vehicle’s performance.

Castrol Edge Advanced Full Synthetic 10W-30 Motor Oil is our top pick for the best oil for Jeep 4.0 engine. It’s a premium grade oil from one of the world’s most trusted engine oil brands. Something that can avoid wear is required for an off-road gasoline engine such as the Jeep 4.0.

It is the purest kind of oil because it is fully synthetic. The use of high-quality base oils ensures that you have a no-compromise experience.

In low-temperature situations, this full synthetic oil often provides a smoother start. So, despite the fact that the suggested viscosity for cold temperatures is 5W-30, this 10W-30 oil should be sufficient. As a result, you will not experience any cold start troubles, which is a common issue with most oils on the market.

It has Fluid Titanium Technology, which means it is built to operate at full potential even under pressure. Given that your Jeep 4.0 engine is undoubtedly old and has been used on rough terrain, this is a decent option. Those who also enjoy pushing their Jeep 4.0 engine to their maximum will love this oil.

This motor oil has been engineered to resist high temperatures which is ten times higher than the most recent industry norm. Furthermore, the wear resistance is six times greater than the Sequence IVA test standards which we found absolutely impressive.

Furthermore, the Castrol Edge eliminates metal-on-metal contact, reducing friction. Friction has a direct impact on engine performance. You won’t have to worry about that if you purchase this one.

It may also provide good fuel economy, particularly in high mileage Jeeps with 100,000 miles on the clock. The best part is that it isn’t even expensive, so you receive high-quality oil for the price of conventional oil.

We were very satisfied with Castrol’s product. There were no shipping issues or missing bottles, which is a common occurrence for most companies nowadays. As a result, you can buy this product with perfect confidence.

Castrol has developed a superior product that outperforms all others on the market, including those mentioned in this article. If you have a Jeep with a 4.0 engine, this is the best oil you can buy.


  • Good value for money
  • Superior than most synthetic-blend and conventional oil in terms of quality
  • Works in extreme temperatures


  • May require replacement sooner

2. Valvoline High Mileage SAE 10W-30 Synthetic Blend

Valvoline is a well-known brand in the automobile oil manufacturing sector. The company’s history spans more than 150 years, with applications ranging from police cruiser fleets to race cars.

This high mileage synthetic blend motor oil with Maxlife Technology meets all of the specific criteria of modern high-mileage jeep engines. The high mileage oil works to revitalize your aging Jeep by removing the gunk that has collected over a lifetime of use.

You will immediately experience improved engine system functionality. Even the pricing appears to be reasonable for the amount of money demanded.

You’ll get the benefits of both full synthetic and conventional oils. The mechanically mixed formula has outstanding molecular structural homogeneity. As a result, immediate change at startup results in increased engine performance.

This synthetic blend contains seal conditioners, which help to rejuvenate aging engine seals and help to stop and prevent oil leaks.

The premium formulation comprises more detergents as well as a greater number of additives. Integral antioxidants prevent oil breakdown from dissolving sludge and depositing to keep engines cleaner with high mileage.

Excellent wear prevention also maintains the engine free of metallic corrosion.

It’s featured 5-Qt container encourages strong sealing techniques. The construction can tolerate external rigors with ease. Of course, the 10W-30 rated oil is secure at the molecular level from the inside out. To reduce spilling, the easy pull tab has a precision pour spout.

This engine oil’s quality is great for the price, and it provides some of the benefits of a full synthetic oil at a considerably lesser cost.

Jeeps can easily travel more than 200,000 miles. So, if your Jeep 4.0 engine has reached that point, this engine oil is thick enough to extend the life of old seals on the engine.

It also does a superb job of blocking and minimizing leakage. It lasts a long time and ensures that the engine works quietly, smoothly, and efficiently. It is more effective than conventional oil at capturing dirt and engine deposits.

Nevertheless, like all engine oils, it will fail, depending on driving style and weather circumstances. On badly worn engines, it will not improve performance. This oil also fails to fulfill the dexos requirement set by General Motors.


  • Rejuvenates engine seals
  • Antioxidants used to prevent oil degradation
  • Anti-wear film that is long-lasting
  • Seal conditioning agents included in the seal


  • Does not enhance engine performance on heavily worn engines

3. Pennzoil Platinum Full Synthetic Motor Oil 10W-30

Pennzoil, like the other manufacturers on our list, is one of the most storied oil producers in the global market, selling millions of gallons of oil each year. Since its start, the company has produced only the best oil and lubrication products in the market.

The Full Synthetic Motor Oil from Pennzoil’s Brand comes in second with over 800 good ratings.
This is another synthetic oil on this list that is unique when compared to other items on the market. Let’s take a closer look at this.

Pennzoil 10W-30 is distinct in that it is composed of natural gas rather than crude oil. Except for Pennzoil, there are no brands that offer alternatives to crude oil-based products.

It is made using greener raw materials and incorporates the company’s unique gas-to-liquid PurePlus technology. This patented gas-to-liquid conversion method, results in a pure synthetic-based composition. With fewer contaminants, the fluid achieves extraordinary mechanical stability. It allows you to conserve fuel, which equates to around 550 miles per year which is quite impressive.

Meanwhile, a comprehensive array of anti-wear additives reduces wear from every angle, even when driving in difficult stop-and-go circumstances. According to the Sequence IVA test, this one outperforms all other brand options. This makes it the ideal product to recommend if you want to extend the life of your engine.

The additives’ combined activity creates an anti-deposit network that extends throughout the mechanism. In comparison to the strictest criteria, the pistons are 45 percent cleaner. Extra wear and frictional protection promotes the anticipated fuel economy.

Furthermore, the oil is effective in high-temperature conditions. You will have easy oil flow while starting the engine in cold weather and no breakdown when using the engine for extended periods of time.

Overall, the oil provides good performance in all areas. Because it inhibits the accumulation of deposits, you will be able to fully utilize your engine. Those who are unaware that deposits accumulate in pipelines, restricting oil flow and making it hard for the engine to produce full horsepower. You no longer have to be concerned about that.

We were once again completely happy with what we received and had no complaints about anything, even shipment, thus this product is automatically laudable.

If you want the best fuel economy out of your Jeep, this could be the model for you. Even though it is a high quality oil, it is more on the affordable end of the price spectrum.


  • Made from natural gas
  • Lower likelihood of deposit formation
  • Can function in high-temperature conditions
  • 550 miles of fuel savings each year


  • Not as good as a synthetic blend or a full synthetic

4. Mobil 1 High Mileage 10W-30 Motor Oil

For many years, Mobil 1 has been a pioneer of high-end motor oil technology, and has been at the forefront of major innovations in that field. As a result, the company has established itself as a perennial powerhouse in the engine oil market.

Mobil 1 High Mileage Full Synthetic 10W-30 is suitable for a Jeep 4.0 engine, notably if it’s very old.

This Mobil 1 High Mileage Oil was designed to provide you with long drain intervals. One oil change can last up to 10000 miles and is designed for vehicles that have traveled over 75000 miles. This is one of the reasons why it is so popular. Furthermore, if you don’t drive too much, you won’t have to bother about changing the oil for at least a year.

The majority of oil burned is at the LSPI stage, also known as low-speed pre-ignition. This product significantly reduces that, providing more oil to the engine for proper operation. In the process, it also cleans your engine, providing you two benefits instead of one: longer engine life and longer intervals between oil changes.

To keep the active status under extreme, the viscosity measures a standard 10W-30. In the winter, the oil remains in a continuous liquid form until 10°C. Meanwhile, 30°C tolerance promotes heat stress resistance in stabilized molecules.

As a result, you won’t have to worry about oil breakdown in high-temperature situations. On the other hand, this device can function flawlessly at temperatures as low as -40 degrees Fahrenheit, making it ideal for persons who drive in cold weather.

This one caused some problems for us, we received absolutely incorrect merchandise or even leaking bottles.

If the manufacturer had packaged their items better, this oil would have easily earned a higher ranking on this list. However, in terms of performance, it is ideal for everyday use.

The synthetic makeup of Mobil 1 High Mileage oil ensures that it is capable of handling any demands that you can put on your Jeep 4.0 engine. In terms of quality, it is comparable to brands like Valvoline and Helix. However, if that’s what you’re looking for, it’s not exactly inexpensive.


  • Excellent for very old engines.
  • Enhances fuel economy
  • Can withstand high temperatures
  • Reduced LSPI’s consumption
  • Longer drain periods


  • Leaking containers
  • A bit expensive

5. Royal Purple SAE High Performance Synthetic Motor Oil

While not as widely recognized as the names Mobil 1, Pennzoil, and Valvoline, Royal Purple has been gaining traction in the oil manufacturing industry for quite some time, with a specialized emphasis in synthetic oil. This brand has always been able to produce great products that have impressed both customers and critics.

Our last best oil for Jeep among Jeep enthusiasts is Royal Purple, so this High-Performance Full Synthetic Motor Oil should be a good fit.

The specialised formulation of the best oil for jeep cherokee provides assistance to certain systems. In comparison to its competitors, the price appears to be reasonable.

As a high-performance oil, this one prioritizes engine health. Following that, it offers good wear resistance. This is feasible thanks to their additive technology, which eliminates metal-to-metal contact. The technology prevents significantly more wear than is required by both the GM dexos1 and the ILSAC GF-6 specifications.

The oil also significantly minimizes friction. A low coefficient of friction indicates that the engine will not have to work as hard to create the necessary horsepower. Furthermore, anti-wear chemicals maintain the pistons clean throughout their service life.

This results in lower RPM and improved fuel efficiency.

To withstand low-temperature extremities and high-temperature stress, the viscosity measures a convenient 5W-30. Because it is 5W-30 oil, it meets the fuel efficiency requirements of a 5W-20 oil. If it doesn’t impress you, I don’t know what would.

Royal Purple’s products are also subjected to extensive testing, as one would expect from a major brand. And, surprise, there was not a single incidence of rusting during these rigorous tests.

This means that the oil will eliminate the possibility of your engine oxidizing. This can greatly lengthen the life of your engine and maintain your oil free of impurities.

Modern turbocharged gasoline engines frequently experience LSPI (Low-Speed Pre-Ignition) issues. Prior to engine initiation, advanced chemistry can promptly remedy the problem and give you a smooth startup.

Furthermore, the oil is the only one that mentions exhaust emission control. The engine’s hazardous emissions are reduced by the anti-wear technology, which is also patented. I don’t know about you, but lowering the environmental footprint would make me happy.

However, instead of receiving the full amount of oil, we only received close to four quarts, note that the bottles were not leaking.

Despite the fact that Royal Purple has made an outstanding product, they should not advertise a fictitious amount of oil as this will cause consumer dissatisfaction.


  • Excellent engine wear protection
  • Excellent for adverse temperatures and humidity
  • Enhanced fuel economy
  • Corrosion resistance


  • Oil amount is less than advertised

FAQs on The Best Oil Additive for Jeep 4.0 Engines

What is the recommended oil change interval for a Jeep Wrangler?

Oil changes should be performed every 7500 – 10000 miles. However, extreme situations necessitate replacement every 7500 miles or so. Meanwhile, conventional oil needs to be changed every 3000 – 5000 miles.

How much does an oil change for a Jeep Wrangler cost?

The cost of oil is just between $40 and $80. Changing the charge is likely to cost between $30 and $40. In total, you’ll have to spend between $70 and $120, with an average of $95 spent.

Conclusion: Get Your Oil For Jeep 4.0 Engine Now

Choosing the best oil for the Jeep 4.0 engine might be tricky. You must avoid products that have poor performance and do nothing but harm to your vehicle.

This list of top products that I believed were excellent oil for the Jeep 4.0 engine has not only been thoroughly tested by people, but it is also created by well-known manufacturers.

I would say the best oil for Jeep 4.0 is the Castrol 03081. It strikes the ideal mix between performance and engine health. Its Fluid Titanium technology is cutting-edge. Whatever product you choose, as long as it is from this article, you will be more than satisfied.

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