How Often Should You Change Your Car's Transmission Oil?

1 Answers
LiamRose
07/30/25 8:54am
Car transmission oil should be changed every two to three years. The primary function of transmission oil is to keep the gear system clean and to lubricate the transmission components, thereby extending their lifespan. Generally, transmission oil includes manual transmission oil and automatic transmission oil. Manual transmission oil is commonly referred to as gear oil, while automatic transmission oil is of a higher grade and is also known as transmission fluid. Importantly, regular gear oil cannot be used in automatic transmissions; automatic transmission fluid must be used instead. Both gear oil and transmission fluid should be selected according to the specific model of the vehicle to ensure proper protection for the transmission. Typically, manual transmission vehicles use gear oil primarily for lubricating the gears, whereas automatic transmission vehicles use automatic transmission fluid mainly for lubricating the transmission and facilitating power transfer.
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