Your car relies on you to maintain it regularly 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 $17, you get a full-service basic or eco-friendly oil change at Cobblestone Auto Spa ($35.99 value), with five locations throughout the Phoenix area.

Caring for Arizona’s cars since 1997, Cobblestone Auto Spa offers thorough yet simultaneously speedy lube swaps that fill up your car's inner tubes with a fresh batch of crankcase gruel. Drop by one of the five participating Phoenix-area locations and enjoy a full-service basic or eco-friendly oil change, which includes up to 5 quarts of oil, a new filter, and an 18-point inspection. With the green oil change, your car will use re-refined oil, which helps eliminate the amount of waste material that's introduced into the environment. This deal also includes a full-service car wash that will remove mischievous dirt more effectively than luring it away with a freshly pressed dress shirt. Customers with faux engines can opt to put the value of their Groupon toward a synthetic-oil upgrade.

Reviews

Citysearchers named Cobblestone Auto Spa the Best Car Wash/Auto Detailing in 2007. Reviewers are mixed on Cobblestone Auto Spa's sales practices for their services, but they praise the customer service and final results. Three Citysearchers give Cobblestone Auto Spa an average of 3.5 stars and eight Yelpers give the business an average of four stars:

• I have been here several times and will continue to go back, not just because it's close to my home, but because the services are good and they do a good job. – Lynne W., Yelp
• The customer service was incredible, from the nice young man who checked my car in, to the cashier and even the service manager who gave me the keys to my car. Cobblestone has Deffinetly [sic] won a LOYAL cutomer [sic]! Great job Cobbelstone [sic]! – bbrooke23, Citysearch