Your car relies on you to regularly maintain it and not to gun it across any rivers, even if there are free Thickburgers on the opposite bank. Keep your vehicular promises with today's Groupon: for $18, you get a full-service oil change and an exterior car wash at Flagstop Car Wash & Quick Lube (a $36.99 value). This Groupon is valid at the Chesterfield and Colonial Heights locations.

During the oil change, Flagstop's certified technicians will replace old, worn-out oil (up to five quarts) with fresh-faced young fluid, straight from lubricant college and ready to take on the heat, dust, and incredible pressures of today's high-octane internal combustion world. A fresh oil filter is included to help new oil adjust to its new job of safeguarding precious moving parts, gaskets, and various shafts. Friendly staff will also run through a full-service 18-point checklist, inspecting belts, hoses, air filters, and the battery while topping off various fluids for dehydrated chariots. This Groupon is also good toward an exterior wash, ensuring that your auto will be restored to its former glistening glory while also banishing harmful toxins from its gaping pores.