Description
PRODUCT DESCRIPTION
Gear Oils 80W90 and 85W140 are superior API GL-5 Gear Oils designed to provide:
Excellent Thermal Stability
Much Improved Oil Seal Life
Much Improved Durability (Gear Surface Life)
Much Improved Corrosion Protection to Yellow Metals under both wet and dry conditions.
Gear Oils 80W90 and 85W140 are specified irrespective of service severity, for the lubrication of car,
truck and tractor differentials and other final drives, transfer and steering gearboxes and manual
transmissions. Special oxidation resistant paraffinic base oils combined with high performance extreme
pressure (EP) additives are formulated in Gear Oils 80W90 and 85W140 to ensure long service life to
transmission drive lines.
BENEFITS
Gear Oils 80W90 and 85W140 avoid lubricant related high temperature degradation problems of
"cooked" transmission synchronisers and reduced oil flow to gear and bearings (due to obstructed oil
passageways or filters) so that costly transmission failures associated with lubricant failure do not occur.
They provide excellent long term protection against pitting fatigue – a life limiting variable of a gear set.
OEM’s recognise that lubricant protection against pitting is a very important design variable for long
transmission life. Field tests, laboratory spalling and power divider snap tests confirm Gear Oils 80W90
and 85W140 ability to give long durability to gear sets.
Corrosion protection is afforded by Gear Oils 80W90 and 85W140 to copper alloys under both wet and
dry conditions. There is no corrosion causing interaction between these metals and the special EP
additives incorporated in Gear Oils 80W90 and 85W140, as may occur with other commercially
available EP additives. The ‘stay-on’ properties of these high film strength lubricants effectively quieten
transmission drive line noise tendencies under all conditions of low speed high torque, high speed low
torque and shock loading. Gear Oils 80W90 and 85W140 avoid the natural development of foam in
transmission service.
CHARACTERISTICS
Gear Oils 80W90 and 85W140 provide protection against the formation of sludge, oxidation and
carbonaceous deposit build-up and excessive viscosity increases, thereby ensuring long service life of
transmission components. Thermal stresses on Gear Oils in modern high performance transmissions
have increased due to the following:
Change in vehicle aerodynamics
Wider use of drive-line retarders
Increased "Power Density" for transmission and rear axles
Extended slow speeds and high loads
Higher ambient temperatures
Higher horse-power
Extended warranties/reduced maintenance etc.
Excessive heat build up can occur (up to 180oC), resulting in oil degradation and increased friction and
wear.
*** Always consult your vehicle owner’s manual for the manufacturer’s lubricant recommendations ***
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