How often should you change a transmission filter?
How often should you change a transmission filter? That's why transmission shops are making a fortune replacing burned out automatic transmissions. For optimum protection, change the Transmission Fluid and filter every 30,000 miles (unless you have a new vehicle that is filled with Dexron III ATF, which is supposed to be good for 100,000 miles). When do I need to change my transmission filter? An automatic transmission is a closed hydraulic devise with no foreign matter being introduced. Therefor, if the filter on a transmission should ever become plugged, it is plugged with transmission parts! This means the transmission is...