For the hydraulic fluid used for automatic transmission, see automatic transmission fluid.
Gear oil is a lubricant made specifically for transmissions, transfer cases, and differentials in automobiles, trucks, and other machinery. It has high viscosity and usually contains organosulfur compounds. Some modern automatic transaxles (integrated transmission and differential) do not use a heavy oil at all but lubricate with the lower viscosity hydraulic fluid, which is available at pressure within the automatic transmission. Gear oils account for about 20% of the lubricant market.[1]
Most lubricants for manual gearboxes and differentials contain extreme pressure (EP) additives 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 such as the copper and/or brass used in bushings and synchronizers, unless properly buffered; the GL-1 class of gear oils does not contain any EP additives and thus used to be the choice in applications which contain parts made of yellow metals.
GL-5 is not necessarily backward-compatible in synchro-mesh transmissions which are designed for a GL-4 oil: GL-5 has a lower coefficient of friction due to the higher concentration of EP additives over GL-4, and thus synchros can not engage as effectively, unless a specialized friction modifier has been included within the oil's additive package; synchro-mesh compatibility is usually explicitly stated and such oils are often known in the trade as TDL (Total Drive Line) oils.
^J. M. Herdan (1997). "Lubricating Oil Additives and the Environment — an Overview". Lubrication Science. 9. doi:10.1002/ls.3010090205.
^Theo Mang; Jürgen Braun; Wilfried Dresel; Jürgen Omeis (2011). "Lubricants, 2. Components". Ullmanns Encyclopedia of Industrial Chemistry. Wiley-VCH. doi:10.1002/14356007.o15_o04.
Gearoil is a lubricant made specifically for transmissions, transfer cases, and differentials in automobiles, trucks, and other machinery. It has high...
un-synchronized until 1996. Synthetic gearoil is required for proper operation and lifespan of the carbon composite gear synchronizers. General Motors used...
A gear is a rotating circular machine part having cut teeth or, in the case of a cogwheel or gearwheel, inserted teeth (called cogs), which mesh with another...
U.S, including the jojoba oil, were used during war as additives to motor oil, transmission oil, and differential gearoil. Machine guns were lubricated...
was manufactured by New Venture Gear, a division of Magna Powertrain. The NV5600 takes a special lubricant, not gearoil. The Mopar part number is 4874464...
vehicle transmission system, where gear changes require the driver to manually select the gears by operating a gear stick and clutch (which is usually...
for gear, axle, and manual transmission oils, SAE J306, which should not be confused with engine oil viscosity. The higher numbers of a gearoil (e.g...
The Metal Gear franchise features a large number of characters created by Hideo Kojima and designed by Yoji Shinkawa. Its setting features several soldiers...
Chrysler's second after the Dodge Viper T-56. The NSG370 does not use standard gearoil for lubrication. This transmission utilizes bronze synchronizer collars...
a gear arrangement in which a worm (which is a gear in the form of a screw) meshes with a worm wheel (which is similar in appearance to a spur gear)....
performance than traditional cellulose fiber filters. AMSOIL has also developed gearoil for wind turbines, with sale trends increasing through the late 2010s during...
Differential oil capacity is about 1 liter. An acceptable differential oil is Redline synthetic MT-90 75W90 gearoil or any synthetic 75W90 GL4 gearoil. Be very...
are part of the range of protective clothing also known as foul-weather gear. Waterproofed cloth garments were in use from the late 18th century. Various...
Total Acid Number (TAN). For example, the breakdown acids found in used gearoil may include carbocyclic acids, ketones, esters, and nitration and sulfation...
Landing gear is the undercarriage of an aircraft or spacecraft that is used for taxiing, takeoff or landing. For aircraft it is generally needed for both...
Castrol Burmah (BOT 0063) manual transmission fluid, or GM 88862472 gearoil. This gearoil is identified in GM documentation as a synthetic 75W-85 GL-4. No...
approximately 99 lb/45 kg and uses 2 quarts/1,9 L of GM 88862472 gearoil. This gearoil is identified in GM documentation as a synthetic 75W-85 GL-4, Castrol...
A synchronization gear (also known as a gun synchronizer or interrupter gear) was a device enabling a single-engine tractor configuration aircraft to fire...
the old oil will not drain out. NOTE: 5W30 engine oil does not contain additives for use in manual transmissions. Additives in standard gear and axle...
It can be added to motor oils and non-motor oils, including gearoil, transmission oil or differentials oils. An entire range was developed from this...
than PAOs. In large gears, PAG lubricant yielded lower friction than PAO lubricant. PAG oils are polar, which means that an oil film easily develops...
15 lb (6.8 kg) per horsepower, including the famous GM hydraulic reverse gear." Quoting from an introductory article (Motor Boating Magazine, August 1950):...
A gear stick (rarely spelled gearstick), gear lever (both UK English), gearshift or shifter (both U.S. English), more formally known as a transmission...
automotive gear oils. It is maintained by SAE International. Key parameters for this standard are the kinematic viscosity of the gearoil, the maximum...
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