Automobiles are not the type of machines that you can passively own. They’re extraordinarily complex machines which are in need of regular monitoring, attention, and care.One of the things that you need to constantly be monitoring is your vehicle’s transmission. Without a properly functioning transmission, your car is as good as dead. In order to keep your transmission operating at optimal levels, it needs to be lubricated with clean transmission fluid. This necessitates the flushing and changing of fluid around every 30,000 miles.