A filter cartridge of a filter group of a fluid of a vehicle extending along a main axis has a base assembly and engagement members, including first engagement members in the filter cartridge and second engagement members in the base assembly, shaped to block each other. The filter cartridge extends along a cartridge axis and includes an engagement plane on which the first engagement members are made having tooth elements diametrically opposite the cartridge axis. Each tooth element extends from the engagement plane parallel to the cartridge axis, having a stalk and a head. In the blocking configuration, the second engagement members engage the head. Each tooth element is radially elastically yielding, so the blocking configuration is achievable following radial movement of the tooth element. The first engagement members include for each tooth element a command device extending radially. Radial movement of the tooth element actuates the command device.