7 Best Gear Oil for Jeep Differential [How to Check Fluid Level]

Gear oil is a very dense and thick fluid, which is mainly formulated for vehicles to withstand high pressure. For getting the optimal performance from your jeep, it’s very essential to ensure the right gear lubricant.

Depending on your jeep and its configuration, you’ve to decide which gear oil will be perfect for maintaining the differential. Also, each gear works differently at different situations based on its additive, viscosity, etc.

Now you might understand that choosing the best gear oil for jeep differential is not that easy. But don’t worry!

To make it easier for you, we’re reviewing some of the best differential fluid along with their features and advantages. Let’s start.

Top 7 Gear Oil for Jeep Differential-Comparisons

ProductSAE ViscosityBase ComponentPrice
Red Line Manual Gear Oil75W-90Full Synthetic
Lucas Oil Differential Lube75W-90Full Synthetic
Valvoline SynPower Gear Oil75W-90Full Synthetic
Royal Purple Automotive Gear Oil75W-90Full Synthetic
Quicksilver High-Performance Gear Lube90WFull Synthetic
Mobil 1 Synthetic Gear Lube75W-90Full Synthetic
Polaris Premium AGL Plus Gear LubeN/AFull Synthetic

Top 7 Gear Oil for Jeep Differential

If you have your own jeep, you must follow the correct maintenance system to uphold the value of your jeep. In fact, for vehicles like jeep, proper care and protection are more necessary.

For that, you have to take care of the jeep’s differential by using the correct jeep differential fluid. So, take a look at the following reviews to find the best differential fluid for your jeep.

1.Red Line (50304) 75W-90 Manual Transmission Gear Oil

Red Line (50304) 75W-90 Manual Transmission Gear OilRed Line MT-90 gear oil offers an excellent protection to the jeep’s gearbox and the synchronizers by softening the necessary synchronizers friction of the gear box.

This gear oil is basically compatible with 80W-90,75W-90, 90, and SAE 40, 10W40, and 15W40 motor oil viscosities. Compared to other fluids, MT-90 is less slippery and best for any kind of transmission.

Features and Benefits

Reliable protection

The most interesting part of this oil is that it doesn’t contain active sulfur. And so it is highly reliable and safe for brass synchronizers. You can truly trust this oil for any synchronized gearboxes.

Gear shifting

Red line MT-90 lubricant works amazingly for fast gear shifting. It simply has the accurate structure of the synchronizer coefficient of friction. Also, this gear fluid helps to minimize the noise and error codes.

Great transmission

The additive in the red line oil is really great for its stunning transmissions with medium and high mileage. The transfer shift will be much smoother and convenient while using this fuel.


  1. Fully synthetic formula.
  2. Highly balanced fluidity.
  3. Quick and easy switching.
  4. Longer synchronizer life.
  5. Ensures stable viscosity.


  1. Not for Hypoid differential gears.

2.Lucas Oil SAE 75W-90 Synthetic Transmission and Differential Lube

Lucas Oil SAE 75W-90 Synthetic Transmission and Differential LubeIf you’re looking for long-lasting, super slick oil for the best performance under several high-pressure applications, then undoubtedly it will the right choice for your jeep.

This popular fully synthetic Lucas oil can deliver accurate performance by reducing wear and friction among the systems of the gearbox.

Features and Benefits

Supreme Viscosity

This differential fluid is formulated with a special additive which helps to retain its lubricity. Even at high pressure, this oil does a fantastic job of preventing the gears from wringing out. A smart choice when you are looking for the best jeep wrangler synthetic gear oil.

Long-lasting Action

The non-foaming, greasy Lucas oil is incredibly durable and reliable. This comes with superb slickness that is good enough to have a long-lasting and gear fluid.

Withstanding Property

Most of the cases, normal gear fuel fails to cope up with extreme pressure and high temperature. But Lucas oil won’t disappoint you.


  1. Heavy-duty formula.
  2. Non-lathering action.
  3. Immediate lubrication.
  4. Minimizes friction.


  1. High sulfur content.

3.Valvoline SynPower SAE 75W Full Synthetic Gear Oil

Valvoline SynPower SAE 75W Full Synthetic Gear OilThe full synthetic Valvoline gear fluid is mainly designed for the protection of the jeep’s gear system, which is highly recommended for limited-slip Hypoid differentials.

At both high and low temperatures, it ensures the softening of the gear and easily handles several extreme loads. It works great with conventional gear fluids.

Features and Benefits

Thermal Stability

This thermally stable specialized oil provides the ultimate protection along with longer service life. In low temperatures, it genuinely offers fantastic fluid protection.

Special Additives

The special additives present in this fluid really help to prevent the gear teeth from decay and rust. Moreover, the chattering in the limited-slip differentials is reduced to a great extent.


Looking for a full synthetic gear oil staying on the budget? Well, it is likely to be the best lubricant at a good deal for maintaining the differentials.


  1. Outstanding wear & corrosion protection.
  2. Non-synchronized, labor-intensive transmissions.
  3. Extreme pressure tolerance.
  4. Limited-slip differentials
  5. Anti-foaming performance


  1. Not for synchronized manual transmissions.

4.Royal Purple 75W-90 High-Performance Automotive Gear Oil

Royal Purple 75W-90 High-Performance Automotive Gear OilThis automotive differential is formulated for maximizing power and protecting the gear from heavy loads. The super synthetic, slippery oil reduces friction and wears even in extremely high loads.

Moreover, this excellent lubricant won’t disappoint you while driving your jeep in cold climates. Its fluidity, lubricity helps to become the perfect choice for cold temperatures.

Features and Benefits

High performance

The super-high-quality features of this gear fluid will deliver the best result in any situation. Especially in cold weather and carrying excess loads, it can be an ideal choice for wear protection.

Ultra-tough automotive gear oil

This gear oil with its high-quality synthetic oil provides extra protection to the system in every tough condition. The Royals Purples proprietary allows them to withstand any shock loads.

No extra additives

You will require no extra additives with this lubricant and highly recommended for jeep, truck, etc. With its high-quality properties and performance, this is listed as the best rear differential fluid.


  1. Corrosion and rust protection.
  2. Longer gear and bearing life.
  3. Compatible with other lubricants.
  4. Suitable for massive loads.
  5. Synchronized manual transmissions.


  1. Slight noise from gear.

5.Quicksilver High-Performance SAE 90 Gear Lube

Quicksilver High Performance SAE 90 Gear LubeQuicksilver gear lube is designed with excess pressure synthetic additives to protect against corrosion and pitting. So, if you’re worrying about the cleanliness of the system parts, it can be the ideal choice for you.

This oil impressively protects the gear from water entering to the gear housing. In the rigorous and critical environment, this liquid managed to prevent the gear from failure.

Features and Benefits

Clean oil

To protect the components from rust, corrosion, and damage, clean oil is necessary. Without any doubt, this formulated clean oil will protect your jeep’s gear and will reduce wear.


The specialized additives present in the oil is really helpful to prevent the metal on metal contact. As a result, it reduces friction and works really well for reducing wear.

High Quality

Quicksilver is the leading brand for providing high-quality oils, accessories, and parts. So, this lubricant will not dissatisfy you with its quality and performance.


  1. Emulsifying contents.
  2. Uncompromising lubricant.
  3. Utmost protection to stern drive.
  4. Consistent viscosity.
  5. Best for mercury lower units.


  1. Somewhat expensive.

6.Mobil 1 75W-90 Synthetic Gear Lube

Mobil 1 75W-90 Synthetic Gear LubeLooking for a gear oil for jeep jk differential? The full synthetic automotive Mobil 1 gear fluid is capable of providing a brilliant performance. And meets all the demands for operating in all temperatures.

Mobil 1 synthetic gear lube comes with awesome lubricants and great for multipurpose. In addition, for high performance in jeep differentials, it is formulated with synthesized hydrocarbon oils.

Features and Benefits

Temperature Range

Compared to other gear fuels, you will get an exceptional performance in a broad range of temperatures.

HP & Torque Retention

The high quality, innovation, and creativity have led this brand to produce the best fuel with maximum torque and horsepower. Buying Mobil 1 means buying quality and efficiency.

Multipurpose Uses

This outstanding synthetic fluid gives an exceptional result starting from high to low temperature and all types of working circumstances. Besides, it doesn’t lack to keep a constant viscosity during the hot running.


  1. Great for limited-slip type differentials.
  2. Extended drain intervals.
  3. Remarkable shear stability.
  4. Increased fuel economy.


  1. Poor response on high pressure.

7.Polaris Premium Synthetic AGL Plus Gear Lube

Polaris Premium Synthetic AGL Plus Gear LubePolaris premium synthetic gear lube is a superior lubricant, which is mainly developed for Polaris ATVs, RZR, and Rangers to keep the performance up to the mark. The AGL viscosity maintains a cold flow protection for high heat shear and extreme temperature.

Features and Benefits

Relying Formulation

With the latest modern technology and additive system, this gear lube plays a vital role in protecting the system parts and to last longer. In fact, the custom additives package is formulated to protect the transmission from chain wear.

Full Synthetic Fluid

The full synthetic and friction-reducing formula is designed to serve in the extreme temperature associated with heavy operating loads. This oil also can be used to make the performance smooth in the aging gearboxes.

Cleaning Components

By preventing oxidation and pitting and deposits, the synthetic AGL plus gear lube helps to keep the components clean and long-lasting. Hence, this oil is not only great for its superb performance but also for keeping the system clean and increasing service life.


  1. Enables shock protection.
  2. Prevents from chain wear, foam, and rusting.
  3. Best for all-season performance.
  4. AGL’s unique viscosity.
  5. Satisfying price-quality ratio.


  1. Only for Polaris 4-stroke vehicles.

Jeep JK Differential Fluid Change Interval

Changing the fluid at a definite interval is necessary to keep the jeep differential noise-free and well lubricated. In fact, providing the best gear oil for noisy differential won’t work, if the oil replacement is neglected.

Actually, heavy driving, maintenance, model, brand etc. features play a vital role for fluid change intervals. But it’s recommended to change the rear differential oil of jeep jk every 15,000-20,000 miles.

How to Check Rear Differential Fluid Level?

Generally, the method of checking the fluid level depends on the model of your jeep. Place the finger into the square hole on the check bolt to get a small amount of the fluid. If the fluid’s color is not light tan, then it’s necessary to change the fluid of the rear differential.

Check out your jeep’s manual guide to know the process more clearly. Nowadays modern jeep with an oil indicator system for informing the fluid level.

Frequently Asked Questions (FAQs)

Question: Is synthetic gear oil better?

Answer: Due to the lower friction coefficient, synthetic gear oil is better for extreme conditions, high loads, and overriding factors.

Question: What happens if you don’t change differential oil?

Answer: The differential might fail or become noisy if the oil is kept too long.

Question: What is the purpose of gear oil?

Answer: Gear oil is mainly designed for manual gearboxes, transfer cases, and transmissions. Also, it’s used to safeguard the parts and gears.


Hopefully, after going through the above seven best gear oil for jeep differential, you’ll be able to choose the correct one that will boost up your jeep’s performance.

For further help, you can visit a jeep forum for clearing any confusion regarding your jeep and the gear oil. Before buying, make sure you know every pros and cons of the oil and check whether it’s suitable for your differential or not.

Otherwise, the wrong gear oil might decrease the lifespan of your jeep gradually. Ride better!

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