The drivetrain of a vehicle consists of the engine, transmission and/or transaxle. This complete system powers the vehicle to take you where you need to go. These are the most expensive components of the car. To keep the drivetrain in optimum working condition, it is important to have regular maintenance services (oil changes and fluid flushes) performed. When a routine safety inspection shows oil or antifreeze leaks, address them immediately so it does not cause premature failure of the drivetrain and end up costing you thousands and thousands of dollars to replace.