Vehicles washing machine, in particular cars or the like, comprising at least one gantry on which a dispensing bar of at least one washing fluid is mounted, wherein the dispensing bar comprises at least one crossbar supporting at least one nozzle dispensing said washing fluid, and wherein the crossbar is rotatably mounted for a predetermined angular amplitude around an axis coincident with and/or parallel to its longitudinal axis; at least one motorised rotary drive unit (414, 514, 614) of said crossbar being provided for rotating said crossbar around said longitudinal axis of rotation, wherein said at least one nozzle is mounted on said crossbar with its central jet propagation axis oriented transversely to the longitudinal extension of said crossbar, said at least one nozzle is fixed to said crossbar in an oscillating manner around an axis perpendicular to a plane parallel to said crossbar longitudinal axis and/or containing said central axis of jet propagation dispensed by said at least one nozzle, said at least one nozzle being provided with a gear reducer member for driving said oscillating motion of said nozzle, characterised in that said gear reducer member for driving said oscillatory motion of said at least one nozzle being assembled on a support terminal of said crossbar which is stationary, i.e. not rotating and is provided at least at one end of said crossbar to which said crossbar is connected so as to rotate around said axis of rotation, said gear reducer member for driving said oscillatory motion being dynamically connected to a slider-crank transmission mechanism, said crank in turn controlling a mechanism comprising at least one oscillating plate (60,61) supporting at least one nozzle, said connecting rod being provided with its longitudinal axis coinciding with the axis of rotation of said crossbar and being connected to at least one control arm of said at least one oscillating plate (60, 61) by means of a ball joint. wherein the dispensing bar comprises at least one crossbar supporting at least one nozzle dispensing said washing fluid, and wherein the crossbar is rotatably mounted for a predetermined angular amplitude around an axis coincident with and/or parallel to its longitudinal axis; at least one motorised rotary drive unit (414, 514, 614) of said crossbar being provided for rotating said crossbar around said longitudinal axis of rotation, wherein said at least one nozzle is mounted on said crossbar with its central jet propagation axis oriented transversely to the longitudinal extension of said crossbar, said at least one nozzle is fixed to said crossbar in an oscillating manner around an axis perpendicular to a plane parallel to said crossbar longitudinal axis and/or containing said central axis of jet propagation dispensed by said at least one nozzle, said at least one nozzle being provided with a gear reducer member for driving said oscillating motion of said nozzle, characterised in that said gear reducer member for driving said oscillatory motion of said at least one nozzle being assembled on a support terminal of said crossbar which is stationary, i.e. not rotating and is provided at least at one end of said crossbar to which said crossbar is connected so as to rotate around said axis of rotation, said gear reducer member for driving said oscillatory motion being dynamically connected to a slider-crank transmission mechanism, said crank in turn controlling a mechanism comprising at least one oscillating plate (60,61) supporting at least one nozzle, said connecting rod being provided with its longitudinal axis coinciding with the axis of rotation of said crossbar and being connected to at least one control arm of said at least one oscillating plate (60, 61) by means of a ball joint.