Like other automotive fluids, the transmission fluid in your car deteriorates over time. Frequent stop-and-go city driving and trailer towing will accelerate the deterioration too. As wear and tear occurs, dirt-like particles become suspended in the fluid and this reduces its effectiveness dramatically. The solution is to replace the old fluid with fresh new fluid.
So, when do you change it? A lot of mechanics say it should be done at least every 50,000 miles. However, the manufacturer’s maintenance schedule for many automatic transmissions doesn’t call for fresh fluid until 100,000 miles or, with some Ford transmissions, even 150,000 miles. It clearly depends on the car. (more…)