Filtration assembly of a fluid of a vehicle which extends along an axis (X-X) and comprises: i) a filtering cartridge ; ii) an auxiliary device ; ii) engagement/disengagement means comprising cartridge members comprised in the filtering cartridge and device members comprised in the auxiliary device , respectively specially shaped to be configurable in an engagement configuration by means of a reciprocal axial action along the axis (X-X) and in a disengagement configuration by means of a reciprocal action of rotation about the axis (X-X); wherein the filtering cartridge comprises at an axial end an end plate on which said cartridge members are positioned extending substantially parallel and about the axis (X-X); wherein the cartridge members comprise at least two blocking groups , each comprising a stem and at least one tooth positioned at the axial end of the stem projecting therefrom in a lateral direction, that is, in a circumferential or tangential direction, defining with the stem an engagement undercut ; wherein the device members comprise at least one housing region and a lug ; wherein, in the engagement configuration, the tooth is housed in a snap-fit manner in the respective housing region specially shaped, and the lug is housed in the undercut ; wherein the cartridge members and the device members comprise a cartridge edge and a device edge , which extends substantially along the axis (X-X), suitable to engage with each other in the rotary disengagement action, wherein at least one of the cartridge edge and the device edge is shaped, identifying a ramp comprising a first edge radially proximal to the axis (X-X) and a second edge radially distal from the axis (X-X); wherein the filtration assembly is characterized by the fact that in the mutual engagement between the cartridge edge and the device edge the respective blocking group flexes elastically in a radial direction in such a way that the tooth leaves the respective housing region . i) a filtering cartridge ; ii) an auxiliary device ; ii) engagement/disengagement means comprising cartridge members comprised in the filtering cartridge and device members comprised in the auxiliary device , respectively specially shaped to be configurable in an engagement configuration by means of a reciprocal axial action along the axis (X-X) and in a disengagement configuration by means of a reciprocal action of rotation about the axis (X-X); wherein the filtering cartridge comprises at an axial end an end plate on which said cartridge members are positioned extending substantially parallel and about the axis (X-X); wherein the cartridge members comprise at least two blocking groups , each comprising a stem and at least one tooth positioned at the axial end of the stem projecting therefrom in a lateral direction, that is, in a circumferential or tangential direction, defining with the stem an engagement undercut ; wherein the device members comprise at least one housing region and a lug ; wherein, in the engagement configuration, the tooth is housed in a snap-fit manner in the respective housing region specially shaped, and the lug is housed in the undercut ; wherein the cartridge members and the device members comprise a cartridge edge and a device edge , which extends substantially along the axis (X-X), suitable to engage with each other in the rotary disengagement action, wherein at least one of the cartridge edge and the device edge is shaped, identifying a ramp comprising a first edge radially proximal to the axis (X-X) and a second edge radially distal from the axis (X-X); wherein the filtration assembly is characterized by the fact that in the mutual engagement between the cartridge edge and the device edge the respective blocking group flexes elastically in a radial direction in such a way that the tooth leaves the respective housing region . <EOS>