Abstract: An improved structure of a vehicle maintenance and washing apparatus is disclosed and the apparatus comprises an air compressor with a pulse pump as a driven source, a one check valve, an engine oil fine filter, at least one or a plurality of strainers, a plurality of three way joints, a plurality of four way joints and a plurality of butterfly valves, characterized an inlet/outlet oil tube and a solvent tube are mounted thereof and the inlet oil tube passes the 1st four way joint and then divides into two routes, the 1st route inlet oil tube may or may not pass the strainer connecting the 2nd four way joint, and the 2nd route inlet oil tube passes the engine oil fine filter, the 3rd butterfly valve and the 1st three way joint and is then connected to the pulse pump, the solvent tube connected to the 4th butterfly valve passes the 2nd three way joint and the 1st three way joint and enters the pulse pump outlet oil tube and from the pulse pump to the one check valve connecting the 2nd four way joint, and from