Gear oil serves functioning as a slippery agent and differentials in automobiles,, Made specifically and other, For transmissions, Transfer casestrucks machinery. It is of a high viscosity and usually contains organosulfur compounds. Some modern automatic transaxles integrated transmission and differential not intended for use a heavy oil at all but lubricate with the lower viscosity hydraulic fluid, That serves as available at force exerted inside the automatic transmission. Gear oils account for about 20% of the lubricant market. 1 most lubricants for manual gearboxes and differentials contain extreme pressure specialized performance enhancers and antiwear additives to cope with the sliding action of hypoid bevel gears. Typical additives include dithiocarbamate derivatives and sulfur, Treated organic compounds sulfurized hydrocarbons . 2 gear oil being added to the final reduction gears in a scooter. Ep additives which contain phosphorus/sulfur compounds are corrosive to yellow metals like various options such as copper and/or brass used in bushings and synchronizers, The gl, 1 class of gear oils lacks any ep additives and thus finds use in applications which contain parts made of yellow metals. Gl, 5 is not necessarily backward, Compatible in synchro, Mesh transmissions which are crafted to suit a gl, 4 oil gl, 5 has a lower frictional coefficient due to the higher concentration of ep additives over gl, 4, And thus synchros can not engage as effectively. .