Pistons and shafts overheat and seize up unless protected by a slick, shiny coating of oil, just like classical Greco-Roman wrestlers. Keep your engine parts from throttling each other with today's Groupon: for $17, you get a full-service 15-point oil and filter change at Qwik Lube (a $34 value). Qwik Lube has serviced all types of four-wheeled metal beasts in its same location for more than 24 years. The friendly mechanics will open up the hood and spoon-feed your buggy up to 5 quarts of oil before changing the filter to prevent the onset of engine burps. Afterward, the technicians will thoroughly inspect the newly lubricated at 15 different points, happily testing the gumption of brake systems and air filters, ensuring the belts and hoses and fluids are topped off, and interrogating the front seat about its lipstick stains.