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 $19, you get a full-service oil change at Valvoline Instant Oil Change (a $38.99 value). This deal is valid at the Centreville, Fairfax, Sterling, and Woodbridge locations in Virginia.

Valvoline Instant Oil Change keeps drivers on the road and engines lubricated with speedy, thorough oil changes. Like an android baby, cars cry out for a new five-quart bottle of conventional oil every three months—entrust autos of all makes and models to the trained technicians at Valvoline Instant Oil Change for a full-service oil change to quell vehicular whimpers and maintain peak engine performance. During the procedure, quick lube pros check in on other liquid levels, from antifreeze to windshield-washer fluid, and perform additional danger-thwarting preventative maintenance checks to ensure horseless carriages are road-ready for at least 3,000 more miles. Total service time averages 10 minutes, or the time it takes to cook 3.33 three-minute eggs.

Though Valvoline Instant Oil Change sometimes features discounts online, today's Groupon still offers the best available deal.