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Is it necessary to perform a flush change for 4AT transmission fluid?

2 Answers

DiEliza

07/25/25 4:26pm

4AT transmission fluid requires a flush change. Below is an introduction to 4AT transmission knowledge: 1. Fluid change interval: The recommended interval for changing 4AT transmission fluid is every 80,000-100,000 kilometers. 2. Overview: A 4AT transmission refers to a 4-speed automatic transmission, meaning it has 4 forward gears. AT transmissions are torque converter transmissions, a commonly encountered type of automatic transmission. These transmissions contain multiple planetary gearsets, which are responsible for gear shifting and torque conversion.

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CamilleAnn

08/11/25 9:48pm

As someone who has run an auto repair shop for 15 years, my advice is that 4AT transmission fluid must be changed regularly. With gravity fluid changes, only half the new oil replaces the old, leaving the rest in the torque converter—like changing the water in a coffee machine without cleaning the grounds. Especially for older cars with over 80,000 km, where sludge builds up like burnt rice crust, using a flush machine with 12 liters of new fluid to clean out the system is the safest bet. Don’t believe the marketing hype about 'maintenance-free' transmission fluid—just last week, I repaired a Camry that fell for this claim, costing the owner 7,000 in major repairs. Buy your own fluid and find a reputable shop; the extra 200 for a flush machine is worth it to extend your transmission’s life by at least three years.

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