An oil filter assembly (58, 158) for an axle assembly (22b, 122b), the oil filter assembly (58, 158) comprising: a filter housing (64, 164) for releasably mounting in an axle assembly housing (50, 150), the filter housing (64, 164) defining an internal volume for containing oil to be filtered; and a mounting arrangement (66, 166) for releasably securing the filter assembly (58, 158) to an axle assembly housing (50, 150), wherein the filter housing (64, 164) comprises an inlet (74, 174) on an upper portion thereof and an outlet (72, 172) on a lower portion thereof to define a flow path therethrough and a filter element for filtering particulate contaminants from oil within the filter housing (64, 164), the filter element is located downstream of the inlet for filtering oil along the flow path, characterised in that: the filter housing (64, 164) comprises a baffle element (80, 82, 84, 180, 182, 184) in the form of a plate (80, 180) separating the internal volume of the housing (64, 164) into a lower chamber (76, 176) and an upper chamber (78, 178), and in that the plate (80, 180) at least partly defines an aperture to allow oil to flow from the upper chamber (78, 178) into the lower chamber (76, 176), and in that the baffle element (80, 82, 84, 180, 182, 184) is configured to restrict backflow of oil from the lower chamber (76, 176) into the upper chamber (78, 178), and in that the filter element is either provided on the filter housing (64, 164) to define the housing outlet (72, 172), or is arranged to substantially cover the filter housing outlet (72, 172). a filter housing (64, 164) for releasably mounting in an axle assembly housing (50, 150), the filter housing (64, 164) defining an internal volume for containing oil to be filtered; and a mounting arrangement (66, 166) for releasably securing the filter assembly (58, 158) to an axle assembly housing (50, 150), wherein the filter housing (64, 164) comprises an inlet (74, 174) on an upper portion thereof and an outlet (72, 172) on a lower portion thereof to define a flow path therethrough and a filter element for filtering particulate contaminants from oil within the filter housing (64, 164), the filter element is located downstream of the inlet for filtering oil along the flow path, characterised in that: the filter housing (64, 164) comprises a baffle element (80, 82, 84, 180, 182, 184) in the form of a plate (80, 180) separating the internal volume of the housing (64, 164) into a lower chamber (76, 176) and an upper chamber (78, 178), and in that the plate (80, 180) at least partly defines an aperture to allow oil to flow from the upper chamber (78, 178) into the lower chamber (76, 176), and in that the baffle element (80, 82, 84, 180, 182, 184) is configured to restrict backflow of oil from the lower chamber (76, 176) into the upper chamber (78, 178), and in that the filter element is either provided on the filter housing (64, 164) to define the housing outlet (72, 172), or is arranged to substantially cover the filter housing outlet (72, 172). the filter housing (64, 164) comprises a baffle element (80, 82, 84, 180, 182, 184) in the form of a plate (80, 180) separating the internal volume of the housing (64, 164) into a lower chamber (76, 176) and an upper chamber (78, 178), and in that the plate (80, 180) at least partly defines an aperture to allow oil to flow from the upper chamber (78, 178) into the lower chamber (76, 176), and in that the baffle element (80, 82, 84, 180, 182, 184) is configured to restrict backflow of oil from the lower chamber (76, 176) into the upper chamber (78, 178), and in that the filter element is either provided on the filter housing (64, 164) to define the housing outlet (72, 172), or is arranged to substantially cover the filter housing outlet (72, 172).