is gear oil the same as transmission fluid


Is Gear Oil the Same as Transmission Fluid?

Transmission fluid and gear oil have a lot in common, but they have important differences as well. Here is a breakdown of the similarities and differences between the two substances.


  • Lubricating Properties: Both gear oil and transmission fluid are used to lubricate components in vehicles. This helps reduce friction and heat in order to keep them running smoothly.
  • High Viscosity: Both types of lubricant have a high viscosity, meaning they are thicker than other types of oil. This helps keep them in place and able to withstand higher pressures.
  • Synthetic Ingredients: Gear oil and transmission fluid are both commonly made with synthetic ingredients, which are more resistant to degradation from extreme temperatures than conventional motor oils.


  • Different Uses: Gear oil is typically used in axle housings and manual transmissions, while transmission fluid is used in automatic transmissions.
  • Varying Formulas: The formulas for gear oil and transmission fluid vary greatly. Gear oil is often designed to cope with extreme pressure, while transmission fluid is designed to protect against wear and tear.
  • Different Additives: Gear oil and transmission fluid have different additives that affect their performance. Gear oil has high levels of extreme pressure additives, while transmission fluid has anti-wear additives.

In conclusion, gear oil and transmission fluid are not the same. While they share some similarities, such as lubricating properties and high viscosity, they have different uses and formulas. It is important to use the right type of lubricant for the job to ensure the best performance and longevity of your vehicle.