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Royal Auto Plus Gear Oil GL-4

Royal Auto Plus 20W50Royal Auto Plus Gear Oil GL-4


Royal Auto Plus Gear Oil GL-4 is high quality gear and transmission lubricant suitable for use in cars, trucks, buses and heavy construction equipment’s. It is formulated from the finest solvent refined base stocks, extensively proven additives like; mild EP, deferment and pour point depressant additives.

Royal Auto Plus Gear Oil GL-4 is a composition of high viscosity index base oils and a balanced extreme pressure additive package designed to prevent scuffing and scoring of gears despite high speed and torque operation. It is a highly stable blend and the mild EP does not attack the synchromesh systems of gearboxes. Further additive treatment enhances oxidation stability and gives excellent protection against rusting, corrosion and foaming.


Royal Auto Plus Gear Oil GL-4 is heavy-duty gear oil for the most severe operating conditions. It has an extended range of applications in the transport, earthmoving and construction industries. It can be used with confidence for the service fill of hypoid, spiral bevel, spur and double reduction gear units, constant of synchromesh gearboxes, transfer boxes etc., suitable in the most severe operating conditions. It meets and exceeds the requirements of API-GL-4, Volvo, MAN 341, US military specification of Mil-L-2105C.


  • Formulated for automotive high-speed operation.
  • Excellent lubrication without channeling at low temperature.
  • Prevent against corrosion.
  • Superior protection against wears.
  • Superior thermal and oxidation stability even at elevated temperatures.
  • Provides protection against rust.
  • Prevents scoring and scuffing of gears even in extreme operation conditions.


Particulars ASTM Result Result
SAE Grade 90 140
Viscosity,cSt @ 40ºC ASTM D 445 119 351
Viscosity,cSt @ 100ºC ASTM D 445 13.6 25.8
Viscosity Index ASTM D 2270 111 97
Flash Point, ºC, ASTM D 92 220 220
Pour Point, ºC, ASTM D 97 -25 -25
TBN mg KOH/g, ASTM D 2896 11 11
Sulfated Ash, wt%, ASTM D 874 <1% <1%