We took my wife's car here on a whim because it needed an oil change and we had a coupon for a free oil change for new Arizona residents. Because we didn't want to be freeloaders, we had them rotate the tires and check the filters too. When our bill came, it was zero dollars. We asked the attendant if they checked the filer and rotated the tires. His reply, "Yep. And free is free." Can't beat that.