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What fluid should I put in my differential?

The fluid you should put in your differential depends on the specific make and model of your vehicle, as well as the type of differential it has. In general, you should use the differential fluid recommended by your vehicle's manufacturer to ensure proper lubrication and performance.


Understanding Differential Fluid


The differential is a crucial component of your vehicle's drivetrain, responsible for distributing power to the wheels and allowing them to rotate at different speeds when turning. The differential fluid, also known as gear oil, is responsible for lubricating the gears and bearings within the differential, reducing friction and wear.


Differential fluids come in various types, including conventional, synthetic, and specialty formulations. The type of fluid you should use depends on the specific requirements of your vehicle's differential, which can be found in your owner's manual or by consulting with a professional mechanic.


Choosing the Right Differential Fluid


To determine the correct differential fluid for your vehicle, you should consider the following factors:



  • Differential Type: Different types of differentials, such as open, limited-slip, or locking, may require specific fluid formulations.

  • Viscosity: The fluid's viscosity, or thickness, is important for proper lubrication and performance. The recommended viscosity can be found in your owner's manual.

  • Additives: Some differential fluids may contain additional additives, such as anti-wear or extreme pressure agents, to improve performance in certain applications.

  • Manufacturer Recommendations: Always follow the fluid recommendations provided by your vehicle's manufacturer, as they have designed the differential system to work best with their specified fluid.


Using the wrong differential fluid can lead to increased wear, reduced performance, and even damage to the differential components. It's important to consult your owner's manual or a professional mechanic to ensure you're using the correct fluid for your vehicle.

Is transmission fluid the same as rear differential fluid?


The differential fluid, also known as gear oil, is specifically formulated to lubricate and protect the gears and bearings within the differential housing. On the other hand, transmission fluid is responsible for lubricating and cooling the intricate components of your vehicle's transmission system.



What happens if you use the wrong differential fluid?


When you use the wrong fluids, it can negatively impact your car's performance. It can result in a breakdown, damage, and poor performance. Using the wrong fluid is one of the worst mistakes that people make. It leads to poor lubrication of auto parts, overheating of the engine, and also transmission failure.



What are the symptoms of low differential fluid?


Hearing a whirring, whining or howling sound, which may indicate the parts, clutches, gears and diff are not properly lubricated through insufficient clean oil. Feeling unusual vibrations, like a chatter, which is caused by a number of mechanical issues, including needing diff oil.



What fluid to use in differential?


There are two types of differential fluid. One is mineral oil, which is a natural, crude oil-based fluid. The other is synthetic differential fluid, which is created in a lab. As with all synthetic oils, synthetic differential fluid oils can be fine-tuned for optimal performance.



What are the signs of a differential going out?


Common Signs of a Bad Differential

  • Abnormal Noises. Abnormal noises are often one of the first signs of a differential problem.
  • Fluid Leaks. Fluid leaks from the differential are usually caused by worn-out seals.
  • Metal-Contaminated Fluid.
  • Power Isn't Transferred to the Drive Wheels.



Which oil is used for differential?


Automotive differential uses hypoid gears exposed to severe operating conditions and it is applied with impact load in driving. Therefore, API GL-4 or 5 single-grade gear oil designed to maintain high viscosity at extreme pressure is used.



What fluid would most likely go in a rear differential?


The fluid used in a differential is typically referred to as gear oil, which has thicker properties than regular engine oils. Viscosity Grades: The '75' in '75w' stands for the oil's viscosity rating.



What oil should I put in my diff?


  • The majority of cars use GL-5, 80W-90 gear oil in the differential, but many, especially newer ones use 75W-90 for better economy in cold weather.
  • But a lot of vehicles used for towing or off-road, use GL-5 75W-140 for the better film thickness under load, and they are designed for that oil.



How do I know if my rear differential needs oil?


To check the level, you remove the fill plug, and stick your pinky in. a little bit. If it gets wet with oil, then it's full. If not you fill it until it starts to leak out.



Can you put transmission fluid in a rear differential?


In emergency situations, you can put transmission fluid in your differential, but beware of the lower degree of viscosity compared to differential fluid. Your vehicle will burn through it quickly, so change it out or replace it with the right fluid as soon as possible.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.