The trill of an air wrench. The falsetto song of a squeegee against glass. The sounds of a stock-car repair pit drift from JC's Speedy Lube, where crews work to focus that same level of efficiency on vehicles returning to the road. Along with expeditious oil changes, mechanics perform light mechanical work and employ Genisys scanners to diagnose future problems. Visitors wait for their steel steeds to return to them, passing the time in a waiting area with free WiFi, a flat-screen TV, and steaming cups of Keurig coffee. JC's Speedy Lube also collects an ever-changing stable of used cars, which wow prospective owners with low mileage numbers and past owners who never drove them very far back in time.