How many kilometers should the Sienna transmission fluid be changed?

2 Answers
SarahLee
07/28/25 6:27pm
Sienna transmission fluid should be replaced approximately every two years or after driving 50,000-80,000 kilometers. Introduction to transmission: A device that changes speed ratio and direction of motion. It is used to alter the torque, speed, and direction of motion transmitted from the driving shaft to the driven shaft under different working conditions. Gear-driven transmissions generally consist of a housing and several gear pairs. Function of transmission: During vehicle operation, to adapt to different working conditions, the driving force and speed of the car need to vary within a certain range. Since the existing engine's torque and speed variation range cannot meet this requirement, the transmission is installed.
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DeKennedy
08/12/25 12:05am
As a long-time Sienna driver, I strongly recommend changing the transmission fluid every 60,000 to 80,000 kilometers, depending on the year and road conditions. New cars might last up to 100,000 kilometers, but older vehicles are prone to issues under heavy loads, especially since the Sienna is an MPV often used for carrying passengers and cargo, putting significant stress on the transmission. Failing to change the fluid on time can lead to degradation, causing rough shifting or overheating issues. Repairing a transmission costs dozens of times more than a fluid change, which isn’t worth it. Personally, I get mine checked at a professional shop every 70,000 kilometers, along with an oil and filter change, to ensure safety and durability. It’s best to refer to the owner’s manual, as different models may vary slightly. If you frequently drive in congested urban areas, consider changing it earlier as a precaution.
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