A radial shaft seal configured for receipt in a housing and about a shaft to sealingly isolate an air-side of the shaft seal from an oil-side of the shaft seal, comprising: an annular mounting portion (14, 15); an elastomeric seal body connected to said mounting portion; a seal lip connected to said seal body, said seal lip having an annular inner sealing surface extending axially between an oil-side end and a free air-side end, said inner sealing surface having a first groove region extending along the shaft in sealed engagement therewith and a circumferentially continuous static rib, said first groove region being spaced axially from said static rib and extending between said static rib and said oil-side end to pump lubrication toward said oil-side of said seal, said first groove region including a plurality of first grooves inclined relative to said static rib along a first direction, said first direction being configured to pump lubrication toward said oil side of said seal during relative rotation of said radial shaft seal with said shaft along a direction R; said inner sealing surface further including a second groove region extending along the inner sealing surface from said static rib toward said air-side of said seal to pump lubrication back toward said oil-side of said seal, said second groove region having a plurality of second grooves inclined relative to said static rib along a second direction, said second direction being configured to pump lubrication toward said oil side of said seal during relative rotation of said radial shaft seal with said shaft along the direction R; and characterised in that said second grooves extend along a reduced angle of inclination relative to said static rib as compared with said first grooves. an annular mounting portion (14, 15); an elastomeric seal body connected to said mounting portion; a seal lip connected to said seal body, said seal lip having an annular inner sealing surface extending axially between an oil-side end and a free air-side end, said inner sealing surface having a first groove region extending along the shaft in sealed engagement therewith and a circumferentially continuous static rib, said first groove region being spaced axially from said static rib and extending between said static rib and said oil-side end to pump lubrication toward said oil-side of said seal, said first groove region including a plurality of first grooves inclined relative to said static rib along a first direction, said first direction being configured to pump lubrication toward said oil side of said seal during relative rotation of said radial shaft seal with said shaft along a direction R; said inner sealing surface further including a second groove region extending along the inner sealing surface from said static rib toward said air-side of said seal to pump lubrication back toward said oil-side of said seal, said second groove region having a plurality of second grooves inclined relative to said static rib along a second direction, said second direction being configured to pump lubrication toward said oil side of said seal during relative rotation of said radial shaft seal with said shaft along the direction R; and characterised in that said second grooves extend along a reduced angle of inclination relative to said static rib as compared with said first grooves.