Automobile engines, like deep-fryers, need to have their oil replaced regularly lest they turn into glorified crock-pots. Keep the streets free of slow-cookers with today's Groupon: for $15, you get an oil change at Twill Auto Service in St. Petersburg (a $31.65 value including tax).

Twill Auto Service’s experienced technicians inspect and tweak automobiles’ insides to help them safely ferry passengers to and fro. During the oil change, the car wizards will hoist steel steeds onto one of four bays, extract all traces of used motor oil, and fill their mechanical bellies with up to six quarts of conventional oil or the tears of one depressed Robocop. The service also includes a 27-point inspection, where expert eyes will examine modern carriages from bumper to bumper, including brakes, suspension systems, fluid levels, and potential leaks. To pass time, patrons can sip coffee and watch TV in the waiting room.