A bushing for a bushing assembly of a heavy-duty vehicle axle/suspension system, said bushing comprising: a cylindrical sidewall (261;461) including: an inner end; an outer end; a central opening (260;460) extending from said inner end to said outer end an exterior surface (212;412); an interior surface (263;463) including at least one groove formed in said interior surface of the bushing; and a flange (259;459) extending radially from the outer end of said cylindrical sidewall; characterised in that (i) said interior surface of the bushing comprises a sealing section integrally formed on the interior surface adjacent the outer end, and wherein a said groove is a groove extending generally in a V-shape on the interior surface, the V-shaped groove extending axially from the inner end to said sealing section and being arranged around a circumference of the interior surface of the bushing, or (ii) said interior surface of the bushing comprises a lip formed on the interior surface adjacent said flange, to form a scraper seal between the bushing and a metal sleeve inserted into said bushing assembly in use, and said at least one groove comprises at least a pair of spiral grooves and at least a pair of counter-spiral grooves formed on the interior surface, wherein said spiral grooves are parallel to one another and extend between said inner end and the lip, and said counter-spiral grooves are parallel to one another and extend between said inner end and the lip, and are directionally opposed to said pair of spiral grooves. an inner end; an outer end; a central opening (260;460) extending from said inner end to said outer end an exterior surface (212;412); an interior surface (263;463) including at least one groove formed in said interior surface of the bushing; and a flange (259;459) extending radially from the outer end of said cylindrical sidewall; characterised in that (i) said interior surface of the bushing comprises a sealing section integrally formed on the interior surface adjacent the outer end, and wherein a said groove is a groove extending generally in a V-shape on the interior surface, the V-shaped groove extending axially from the inner end to said sealing section and being arranged around a circumference of the interior surface of the bushing, or (ii) said interior surface of the bushing comprises a lip formed on the interior surface adjacent said flange, to form a scraper seal between the bushing and a metal sleeve inserted into said bushing assembly in use, and said at least one groove comprises at least a pair of spiral grooves and at least a pair of counter-spiral grooves formed on the interior surface, wherein (i) said interior surface of the bushing comprises a sealing section integrally formed on the interior surface adjacent the outer end, and wherein a said groove is a groove extending generally in a V-shape on the interior surface, the V-shaped groove extending axially from the inner end to said sealing section and being arranged around a circumference of the interior surface of the bushing, or (ii) said interior surface of the bushing comprises a lip formed on the interior surface adjacent said flange, to form a scraper seal between the bushing and a metal sleeve inserted into said bushing assembly in use, and said at least one groove comprises at least a pair of spiral grooves and at least a pair of counter-spiral grooves formed on the interior surface, wherein