Over the course of 31 years, the smiling staffers at Express Oil Change & Service Centers have learned that customers just want their oil changed fast. Instead of selling extra parts out of an oversize trench coat, staffers work quickly and efficiently to give cars what they crave; quarts of thick, black oil in the blink of an eye without an appointment. Each procedure lasts approximately 10 minutes, during which mechanics will replace the vehicle's oil and inspect its innards for problems. The process is so quick that customers can even wait inside their own vehicles while it occurs, much like a drive-thru car wash or drive-thru dentist appointment.