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 (up to a $38.99 value). This Groupon is valid at Valvoline’s Fairfax, Sterling, Woodbridge, and Centreville locations.

At Valvoline Instant Oil Change, SuperPro 10-certified technicians change oil, lubricate the chassis as needed, and perform preventative maintenance checks all over the vehicle. Total service time averages 10 minutes, or the time it takes to cook 3.33 three-minute eggs. First, a technician replaces old lubricant with up to five quarts of Valvoline oil, the preferred brand of the National Institute for Automotive Service Excellence. Staffers then replace the oil filter with a brand-new one to help protect engines against foreign agents, soot, and desperate oil tycoons. Finally, motor gurus inspect a slew of vehicular components, including transmission fluid, antifreeze, and tire pressure to verify the overall health of four-wheeled friends. Upon request, technicians can check the differential fluid or transfer case fluid during a more reliable service than asking a psychic to read tea leaves on the bumper.