I got my automatic transmission serviced. 2008 E82 128i coupe.The Fluid was pretty dark and dirty with only 46,000 Km.(Kilometers) that's 28,750 miles. The new ATF fluid looks clear golden translucent colour. BMW Canada and USA says it's a lifetime fill. When you see for what the ATF should look like it's no wonder why owner's who keep their Bimmers have it changed. Seeing is believing. I plan to keep my car for at lest another 6 years.