Check the maintenance schedule in your owner's manual because the recommended intervals from vehicle manufacturers are all over the board, from as early as 40,000 miles to as long as 150,000. Some even say it never has to be changed, though many mechanics advise that it should be done every 50,000 miles to be safe. As with engine oil, it doesn’t hurt to change transmission fluid more often than is recommended, but you might be paying for extra for little benefit. If your transmission has a fluid filter, it should be changed every time the fluid is changed (although some filters can be cleaned).
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