Gear and transmission systems pose unique and different challenges to engine oils. Gear oils require rear axle and manual transmission specifications to be achieved. For example, limited slip performance may be achieved through carefully balanced friction modifiers and critical antiwear/extreme pressure performance additives.
Industrial gear oils involve different specifications and finished oil grades to be achieved. Automatic transmission fluid additive packages are typically formulated to provide antiwear, oxidation resistance, sludge and varnish control and anti-shudder durability.