Abstract: A method for lubricating a manual transmission or automated manual transmission apparatus having metallic synchronizers which comprises supplying to said transmission a lubricating composition comprising a major amount of an oil of lubricating viscosity containing effective amounts of two ZDDP's, a thiadiazole corrosion inhibitor, a fatty acid primary amide and at least one each of a supplemental anti-wear agent, a dispersant, an antioxidant and a metal detergent.