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.