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When should a transmission be flushed?

Updated: 10/24/2022
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19y ago

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Generally for "severe service" (normal stop-and-go short trip driving) an automatic transmission should be drained, the filter replaced and refilled every 25,000 miles. On most light vehicles it is rather involved to replace the fluid in the torque converter. You normally only replace what drains out when you take the pan off to replace the filter. If done every 25,000 miles almost all the fluid will eventually be replaced after several changes.

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19y ago
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Q: When should a transmission be flushed?
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