A rotary seal for location by a first machine component and for dynamic sealing engagement with a generally cylindrical relatively rotatable surface of a second machine component and for serving as a partition between a first fluid of a lubricant supply and a second fluid and for retaining a volume of said first fluid, the rotary seal being generally ring-shaped and comprising: generally axially-facing surfaces forming a first seal end and a second seal end, said first seal end and said second seal end facing in generally opposite directions; a dynamic sealing surface of annular form facing in a radially inward direction and located in intermediate relation to said first seal end and said second seal end; a multi-function edge extending in a generally circumferential direction and located in intermediate relation to said dynamic sealing surface and said first seal end and having a first edge end and a second edge end, said first edge end being circumferentially separated from said second edge end, at least a portion of said multi-function edge skewed with respect to said second seal end and at least a portion being generally convex when viewed in longitudinal cross-section, said first edge end being farther from said second seal end compared to said second edge end; an angled flank located in intermediate relation to and adjoining said first seal end and said multi-function edge and forming an obtuse angle with said first seal end; a circumferential portion of said multi-function edge forming a ramp section having a first ramp end at said first edge end and having a second ramp end intermediate to said first edge end and said second edge end, said ramp section curving radially outward from said second ramp end and said ramp section being recessed relative to said dynamic sealing surface at said first ramp end; a recess flank located in intermediate relation to said dynamic sealing surface and said ramp section and adjoining said dynamic sealing surface, at least a portion of said recess flank being generally convex when viewed in longitudinal cross-section; and a recess located in intermediate relation to said dynamic sealing surface and said first seal end and formed at least in part from said ramp section and said recess flank, at least a portion of said recess having a sloping profile in a circumferential direction and forming a smooth transition with said dynamic sealing surface in a circumferential direction; said first seal end adjacent to and forming an inner body corner with said angled flank and with said ramp section, and said inner body corner undulating in a radial direction. generally axially-facing surfaces forming a first seal end and a second seal end, said first seal end and said second seal end facing in generally opposite directions; a dynamic sealing surface of annular form facing in a radially inward direction and located in intermediate relation to said first seal end and said second seal end; a multi-function edge extending in a generally circumferential direction and located in intermediate relation to said dynamic sealing surface and said first seal end and having a first edge end and a second edge end, said first edge end being circumferentially separated from said second edge end, at least a portion of said multi-function edge skewed with respect to said second seal end and at least a portion being generally convex when viewed in longitudinal cross-section, said first edge end being farther from said second seal end compared to said second edge end; an angled flank located in intermediate relation to and adjoining said first seal end and said multi-function edge and forming an obtuse angle with said first seal end; a circumferential portion of said multi-function edge forming a ramp section having a first ramp end at said first edge end and having a second ramp end intermediate to said first edge end and said second edge end, said ramp section curving radially outward from said second ramp end and said ramp section being recessed relative to said dynamic sealing surface at said first ramp end; a recess flank located in intermediate relation to said dynamic sealing surface and said ramp section and adjoining said dynamic sealing surface, at least a portion of said recess flank being generally convex when viewed in longitudinal cross-section; and a recess located in intermediate relation to said dynamic sealing surface and said first seal end and formed at least in part from said ramp section and said recess flank, at least a portion of said recess having a sloping profile in a circumferential direction and forming a smooth transition with said dynamic sealing surface in a circumferential direction; said first seal end adjacent to and forming an inner body corner with said angled flank and with said ramp section, and said inner body corner undulating in a radial direction.