Best Gear Oil and Differential Oil for your Car, Truck and SUV- 2019

Some of you already know that the environment inside a gearbox of a car is extreme in the lack of a better word. The gears spin fast, the tolerances between them are almost microscopic and the torque they must transfer is massive. All of this suggests, that you need the best gear oil for your car. It will keep the gears and the components in perfect order and it will make sure there is no damage to the elements. All of this translates into a longer lifespan of a gearbox. Let’s see the best oils of this kind.

Image
Red Line 50304-12PK...
Mobil 1 104361-UNIT...
Valvoline SynPower SAE...
Lucas Oil LUC10043 Oil...
Liqui Moly (20010) 85W-90...
Quicksilver 858064Q01...
Model
MT-90 75W90 GL-4
Synthetic Gear Lube - 75W90
Valvoline, Dexron/Merc
051-503
FBA_20010
858064Q01 High Performance SAE 90 Gear Lube
Image
Red Line 50304-12PK...
Product Name
Model
MT-90 75W90 GL-4
Image
Mobil 1 104361-UNIT...
Product Name
Model
Synthetic Gear Lube - 75W90
Image
Valvoline SynPower SAE...
Model
Valvoline, Dexron/Merc
Image
Lucas Oil LUC10043 Oil...
Model
051-503
Image
Liqui Moly (20010) 85W-90...
Model
FBA_20010
Image
Quicksilver 858064Q01...
Model
858064Q01 High Performance SAE 90 Gear Lube

The Best Gear Oil and Differential Oil

01.Red Line 50304-12PK Manual Transmission

Red Line 50304-12PK Manual Transmission is the best gear oil we were able to find. The thing we liked the most is the shifting enhancement. The first time you drive your car using this oil in the gearbox you will see that shifting gears is ‘’softer’’ and more appealing than usual. The tolerance between the gears looks decreased and the overall experience is a much better gearbox performance.

The next best thing is the protection of the gears and the gearbox in general. The oil has special compounds that will literally glue and stay on the gears, bearings, and gearbox forks and stay there. These compounds decrease wear and tear significantly and they make sure a gearbox can last longer, withstand heavy-duty stress and perform without an issue in the future.

All modern gearboxes have synchronous which are designed to make the transition between the gears smoother. The oil we have here affects these components as well. What this means is that it is fully compatible with the synchronous and it works just right in all conditions. This is just one of the reasons why shifting is more pleasant and more appealing.

Pros:

  • Protection across all temperature ratings
  • Improves shifting
  • Customer support
  • Lifespan

Cons:

  • Expensive
  • For newer vehicles only

02. Mobil 1 104361-UNIT 75W-90 Synthetic Gear Lube

There are a lot of things you will like about the oil in question. There are a lot of benefits and advantages we all like. First and foremost, the oil is superb when it comes to protecting the gears, bearings, and all other components in a gearbox. It is capable of prolonging the service interval, significantly and it is even great value for the money. Drivers will definitely appreciate this advantage the most. The main reason why this or how it is possible is in the oil itself. It protects silicone and rubber seals inside a gearbox, hence the service interval is prolonged.

The oil is beneficial for limited-slip differentials. What it does is improves traction between the plates inside the unit and improves performances as well. We liked this benefit and we believe it is important for the drivers who look for a cheap way to make their car better and more ‘’racey’’. Of course, the oil is perfectly fine to be used in ordinary cars by ordinary drivers.

Rust prevention on the copper and alloy materials is important for all cars. We are glad to say that the oil provides this advantage as well. Thanks to the chemical compounds inside the oil, elements made from these materials are going to be well-protected at all times.

Pros:

  • Ideal for limited slip differentials
  • Copper and alloy protection
  • Protection at low and high torque
  • Value for money

Cons:

  • Limited information
  • Sensitive package

03.Valvoline 773636 Automotive Accessories

Valvoline 773636 Automotive Accessories is the best gear oil for cars and trucks. It is considered as suitable for heavy-duty usages and it can withstand all kinds of stress a driver can put on his gearbox. Of course, the oil has been tested and approved for the car usage.

The oil we present is made and tested in the United States. This is more important than you may believe. The main difference is in the regulations oils and lubricants must meet in this country. For us, it is another proof that the oil is well-made and it works as promised.

In a nutshell, the oil is suitable for drivers who care about their vehicles but also consider the price of the oils and maintenance. Basically, you will get affordable gear oil that has a long lifespan, does all that is supposed to do, and protects your gearbox. After all, it is made by one of the leaders in the world of car oils and it meets all the rules and requirements you can think of. In simpler terms, we highly recommend this oil and we know you will be satisfied with it.

Pros:

  • Package
  • For cars and trucks
  • Meets last regulations
  • Popular at the moment

Cons:

  • Small opening on bottles
  • Customer support

04. Lucas Oil LUC10043 Clear 1 Quart

Now we present you a special type of gear oil. It is different in many parts than similar products on the market. This product is optimized for heavy-duty applications and can be used for taxis, commercial vehicles and etc. There is a reason for this claim. The oil contains agents that decrease wear and tear and promote better cooling of the gears inside a gearbox. You can see them stick to the parts even when using Parts washer solvent.

Controlling heat or better said decreasing the heart from the gears is one of the main purposes of excellent gear oil. In this case scenario, we should add that this product is excellent in this action. A lower temperature will maintain the proper health of the components and make sure there is no discoloration that suggests the compound of the metal is affected.

The last thing is the recommendation for the drivers who want performance. The oil is capable of meeting any requirement you may have and you can enjoy driving your car as rough as you like. Your gearbox will be perfectly protected at all times.

Pros:

  • For heavy-duty applications
  • Lubricant agents
  • Temperature control
  • Anti-wear agents

Cons:

  • Obsolete package
  • Loose Tops

05. Liqui Moly (20010) 85W-90 GL-5 High-Pressure Gear Oil

A thing you must know about the Liqui Moly (20010) 85W-90 GL-5 High-Pressure Gear Oil is its origin. This isn’t synthetic oil but a mineral one. There are a few additional facts we must reveal. The first one is the benefit of older cars. They are designed for use with mineral oil, so this product will be recommended to them specifically. It isn’t suitable for newer cars.

The oil is also developed for the high-load transmissions. Its compound is different than standard oils have and as such, it can withstand more torque for a longer period of time. You will want to know that the oil is made from the best ingredients and it meets all the requirements available today.

To summarize, the oil is mineral, recommended for older vehicles and it is made from the best ingredients possible. At the same time, the oil is affordable and comes in a great package. Keep in mind that it is completely different than Engine oil and it must not be used for that purpose.

Pros:

  • For older vehicles
  • Withstands high torque
  • High pressure
  • Affordable

Cons:

  • Isn’t suitable for newer vehicles
  • Lifespan

06.Quicksilver 858064Q01 High Performance

The last oil on our list comes with specific properties. It is made for engines with 75HP or above. There is no need to add that the oil shouldn’t be used in engines with lower power output. It is advertised as high performance and it meets the corresponding purposes. The oil is top-notch when it comes to quality and can be used for a long period of time.

Standard features are present as well. For instance, the oil will maintain the health of the gearbox and decrease the wear of all components. At the same time, it is superb for cooling down a gearbox and will make sure there are no damages. All of this is important for high-performance vehicles.

The price is decent and we can add affordably. In other terms, oil has been one of the most popular products of this kind and it definitely deserves your full attention. Luckily it caught our attention so we were able to test it and recommend it to our readers.

Pros:

  • For high-performance vehicles
  • Package
  • Usability
  • Anti-wear agents

Cons:

  • Lack of information
  • Shipping issues

Gearbox oil types:

There are several types of gear oils and we will explain all of them. Keep in mind that smaller Transmission Fluid Color differences may apply. We can see 4 main types which will be mentioned below.

  • R&O Gear Oil- This stands for rust and oxidation oils and they are designed to protect the gearbox from corrosion and rust. Almost all newer oils have some kind of this protection. Oils of this kind can protect the components from oxidation (debris) and corrosion which can weaken some parts inside a gearbox or transmission.
  • High pressure- Oils of this kind are designed to withstand extreme heat and pressure for a long period of time. Additives have a huge role in this case and we can see additions such as sulfur or chlorine. They are used only when the manufacturer recommends the use.
  • Compound Gear Lubricants- These oils are paired with additives and fatty oils. They can withstand high pressure at a low speed and their viscosity is significantly improved. They are usually used for heavy-duty, slow vehicles.
  • Synthetic oils- Synthetic oils are the latest addition to the world of lubricants. They usually have a much longer lifespan than mineral oils, contain additives, and very popular at the moment.

Gear Oil Change YouTube Video

Gear oil vs transmission oil:

Gearbox oil may sound like a transmission oil, but these two are completely different. Gear oil is made for manual transmission only. It is thick, heavy and it can withstand a lot of heat. It is primarily designed to lubricant the gears and then to cool them. It doesn’t have the third purpose. These oils are dark brown or yellow. They can be used for gearboxes, differentials, and transfer boxes.

Transmission oil is usually red and it is thin, lightweight oil with a lower viscosity than the gear oil. It cools the transmission and helps it change gears. It can last much longer than the gear oil and it is usually more expensive. This type of oil can be used for automatic transmissions only.

The main difference you need to remember is that transmission oil goes into automatic transmission only. It must not be used in a manual transmission. A manual gearbox requires gear oil and it won’t work with transmission oil. As a matter of fact, if you switch the oils, you are at risk of serious damage.

Difference between gear oil and differential oil

Synthetic gear oil has been the most common choice of us many. But what about differential oil? The thing you need to remember is that these two oils are not the same. As a matter of fact, they are completely different. They are designed for a similar purpose, yet they act in a completely different manner. We will explain the difference.

Gear oil is designed for gears that link to one another under a straight angle. Basically, gears are in a horizontal line. This type of movement requires a low shear lubricant and as such, gear oil offers precisely this. Differential gears are different. They slide one to another and as such, they need a high shear oil. This is basically the main difference.

Theoretically, you can use gear oil in differential, but you will decrease its lifespan significantly and you will be at risk of the major damage. Keep in mind that differential oil is referred sometimes as differential fluid and it comes in different packages. Always use a high-quality oil of this kind. The changing interval is much longer than for gear oil and in general, it should be replaced once per 2 gear oil changes.

Gear oil additive

Lucas gear oil additive made a quite impression for the highest number of drivers. You may have heard for additives in general or for a positraction gear oil additive. These are additions, chemical compounds added to the oil. They decrease the wear and tear inside the gearbox and they prevent possible issues. They also can prolong the lifespan of that gear oil and provide additional protection. All of these additives do work and they are used as prevention rather than a solution. On the other side, we can see some people who use additives to fix minor issues with their gearboxes. This works, sometimes.

Gear oil API ratings

The following API standards are developed by the American petroleum institute.

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SAE gear oil viscosity chart

SAE viscosity The temperature at 150000 cP Lowest viscosity at 100 degrees C Max viscosity at 100 degrees C
110 17.4 <24.0
140 23.74 <32.5
190 33.33 <41.0
250 48.49
70W -55 3.72
75W -40 4.4
80 8.02 <11.0
80W -26 5.29
85 10.15 <13.5
85W -12 6.46

How to change rear Differential Fluid (detailed version)

FAQ: 

Is all gear oil the same?

No, they are not. Some are made for cars only, others for trucks or a specific vehicle. Some can withstand heat better, others are for high-torque. Oils range between mineral and synthetic and come with different viscosity ratings.

What type of oil is used in a gearbox?

You can use mineral or synthetic. Synthetic oils are made from PAO, esters oils, or polyglycerols. They are completely different than Brake Fluid or automatic transmission oils.

What is 80w90 gear oil used for?

This oil is designed for heavy pressure and high torque outputs. It can be used in trucks and in busses. You can use it for limited-slip or conventional ones. What this means is that the type of oil is designed for heavy-duty usages. It is made for manual transmissions only.

What do gear oil numbers mean?

For instance, 80w90 means that the oil must maintain the viscosity of 80 in winter. W stands for winter and not for watts or etc. The highest number is a viscosity oil must maintain at a temperature at 100 degrees C. This is a standard that applies to all oils.

What does GL 5 mean in gear oil?

GL 5 refers to gear oils that are made for different purposes. They can be used in most transmissions (manual only) and they offer rust and oxidation protection and can withstand a lot of heat and pressure.

What color should gear oil be?

New gear oil should be blue, red, or green color. Yellow is also possible. Used oil will be black or extremely dark brown.

What is the difference between engine oil and gear oil?

Engine oil is much thinner in viscosity and it is made to reach all the moving components inside an engine and to lubricate them. Gear oil is much thicker and it is made to lubricate bigger components for a long period of time. They must not be mixed.

Conclusion

Today you were able to see the best gear oil for your vehicle. We tested them in different situations and with different gearboxes to provide you the ultimate list. Our rating is obvious and we are proud to say these are some of the best oils ever made. Take your time, and pick the one that meets all your requirements.

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