How Often Should the Transmission Fluid in a Buick Envision Be Changed?

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The transmission fluid in the Envision should be changed approximately every 80,000 kilometers. Transmission fluid serves the functions of cooling, lubricating, and transmitting power within the transmission. Below is some information about transmission fluid: Automatic Transmission Fluid: This is a specialized fluid used exclusively in automatic transmissions. Early automatic transmissions did not have dedicated fluid and instead used engine oil. Due to significant differences in operating conditions and technical requirements, the practice of using engine oil as automatic transmission fluid was quickly phased out. Manual Transmission Fluid: Commonly referred to as gear oil, it is categorized into five grades (GL-1 to GL-5) by the American Petroleum Institute based on quality levels. GL-1 to GL-3 have lower performance requirements and are used for lubricating spur and bevel gears under general load conditions, as well as gears in transmissions and steering systems.