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 $12, you get an oil change, tire rotation, and 50-point inspection at Superior Transmission and Auto Repair (a $24.50 value).

Superior Transmission and Auto Repair's ASE-certified technicians keep cars roadworthy with preventative-maintenance services for all major car brands. Technicians freshen motors with an oil change, which keeps engines well lubed to prevent friction-incited corrosion and overheating. To ensure even wear on tire treads, vehicle caregivers complete a tire rotation, letting rubber rollers play one round of musical wheel wells. Mechanics complete a 50-point inspection to thoroughly check autos' vital systems, inspecting the roadster's full body for such potentially disastrous malfunctions as leaking engines, worn-out breaks, and ingrown windshield wipers.