The closest Mechanic in Washington DC is GP Auto Services, they will definitely guide you with auto repair shops in Washington, USA

Your vehicle's engine relies on routine oil changes to operate correctly, Our agrees that a driver should get an auto-shop visit every 3,000 - 7 thousand miles or three months; however you can always refer back your owner’s manual which covers recommended intervals by make and model of car currently in use! Many newer cars will actually tell when they are due for service as well: remember this is essential because without it there could be sludge build up resulting from dirty injectors preventing proper operation, Visit GP Auto Services at 400 Rhode Island Ave NE, Washington, DC 20002 or call (301) 332-8228 to schedule an appointment