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Q: When do I need a transmission oil change?

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My car has 34000 miles.
My car has an automatic transmission.

A: The industry rule of thumb is to replace tr...

The industry rule of thumb is to replace transmission fluid every 40,000 miles. Some vehicles call for it to be changed sooner, some later. The recommended service intervals should be listed in your vehicle's owners manual, available with a call to your local dealer, or possibly in a service manual from an auto parts store.

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