What it is: Your automatic transmission has a lot of moving parts. These are bathed in Automatic Transmission Fluid (ATF) that keeps things running smoothly. ATF, like all auto fluids, can break down over time because of high heat. It turns brown, may smell "cooked" and can leave varnish on parts. As the fluid fails, your transmission works harder and hotter, and you may end up with an expensive repair. Your owner's manual can tell you when it's time to change transmission fluid. It's usually around 30,000 miles.
Benefit: Regular ATF changes keep your automatic transmission healthy. It works better and cooler. You are much less likely to need repairs, which can cost thousands of dollars. You may also notice smoother shifting.
Find out more about what transmission fluid does.
