Automotive gear oil, also known as transmission oil, is a specialized lubricant used to protect and improve the performance of automobile transmissions. These oils perform important functions in the transmission, including: Reducing friction and wear: Gear oil helps to increase the life of the parts and reduce wear by reducing the friction between the moving parts of the gearbox. Cooling: Gear oil helps cool the transmission, especially during heavy use or in high temperature conditions. Corrosion protection: Additives in gear oil help protect the metal components of the gearbox from corrosion. Cleaning: Some gear oils contain cleaning agents that help remove deposits and wear particles from inside the gearbox. Improved performance in different conditions: Gear oils should be able to perform well in different temperature conditions, from extreme cold to extreme heat. Car gear oils are different based on the type of gearbox (manual or automatic) and the specifications of the car manufacturer. For automatic transmissions, ATF (Automatic Transmission Fluid) oils are usually used, which have special properties and additives for optimal performance in this type of transmission. While for manual gearboxes, oils with different viscosity and properties are used. It is important to always use the type and specification of oil recommended by the vehicle manufacturer for your vehicle's transmission to ensure optimal performance and long transmission life.