On the 2003 Honda Civic, according to the Honda Normal Service Schedule, the Transmission fluid should be replaced at intervals of every 120,000 miles. There is no recommended interval at which to “check” the fluid, but common practice is at every Oil Change. As long as there are no leaks, the system should never fall below recommended levels. When replacing the transmission fluid, you must make absolutely sure that the system is refilled with Honda ATF-Z1 fluid. The use of ANY other fluid, or “universal” fluid WILL cause transmission shifting problems and/or failure! Transmission fluid is added into the dipstick tube. So, remove the dipstick and insert a suitable funnel to add the fluid.
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