A seal (42, 82) for a shaft (22) of a turbocharger (10) to prevent liquid from leaking out of a bearing housing (16). The seal (42, 82) includes a cylindrical body extending between opposite end faces (116, 118) and has a cylindrical bore extending between the opposite end faces (116, 118) for receiving the shaft (22) therethrough. The cylindrical bore defines an inner surface (106) having at least one striation (112) extending in a helical direction about the shaft (22). Rotation of the shaft (22) relative to the seal (42, 82) causes a pumping effect on liquid present between the shaft (22) and the inner surface (106) of the seal (42, 82), thereby causing the liquid to flow back towards the bearing housing (16).