The invention of the horseless carriage revolutionized transportation and forced horses to settle for jobs as professional carousel riders. Keep cars running and horses standing with today's Groupon: for $18, you get a full-service express oil change at Airline Quick Lube in Bossier City (a $37.99 value). This Groupon is valid for up to 5 quarts of Castrol GTX motor oil, though customers may use this Groupon toward the cost of more expensive oils or specialty filters.

A member of the Automotive Oil Change Association and a family-owned-and-operated business, Airline Quick Lube staffs experienced and friendly technicians to deliver full-service oil changes in 15 minutes or less. These handy mechanics replace old, worn-out oil with 5 quarts of fresh-faced young Castrol GTX motor oil, straight out of lubricant college and ready to take on the heat, dust, and incredible pressures of today's high-octane internal-combustion world. Dexterous hands then check the condition of air filters, breather elements, PCV valves, belts, and hoses before topping off transmission, transaxle, brake, and windshield-washer fluids. To conclude vehicular pampering sessions, they'll also vacuum the front floorboard, clean the windshield, and check the tires during a ritualistic dance that dates back to the ancient mechanics of Mesopotamia.

Although the staff aims to complete service in 15 minutes or less, clients may wait longer while their car is in line to be serviced.