70W80 GL-4 This 75W80 GL-4 Gear Oil (SAE 5W30/10W30 engine oil viscosity) is designed for use in manual transmissions and transaxles. Provides excellent protection of gears and synchronizers and its balanced slipperiness provides a perfect coefficient of friction, allowing easier shifting. Popular in many BMW transmissions and in most Honda and Acura transaxle applications.



75W85 GL-5 A friction-modified gear oil designed for use where 75W85 GL-5 gear oil is recommended (may be too slippery for some syncros). Used in many motorcycle applications as an alternative to ShockProof types. It has excellent low-temperature flow which allows easier shifting when cold and good synchro compatibility. May be used to obtain maximum power transfer in racing differentials which do not see high temperatures.


MT-90 75W90 GL-4 Popular in Nissan, Toyota and Mazda manual transmissions and transaxles as well as other selected applications, this is a 75W90 GL-4 Gear Oil that's slightly heavier than MTL. Provides excellent protection of gears and synchronizers and its balanced slipperiness provides a perfect coefficient of friction, allowing easier shifting.



MT-85 75W85 GL-4 Recommended for Nissan 350Z and 370Z (also most Maxima, Altima & Sentra), Mitsubishi Evolution, Hyundai, and Kia applications. Many NV4500 truck transmission applications like Chevy Silverado and Dodge Ram. Safe for brass synchros, as it lacks the reactive sulfurs found in most GL-5 oils that cause damage. Offers quicker shifts, perfect synchronizer coefficient of friction. Recommended for GL-1, GL-3 and GL-4 applications, as well as where most special synchromesh fluids are specified.




Red Line Oil Synthetic Gear Oil MT-85 75W85 GL-4


Synthetic Gear Oil
  • MT-85 75W85 GL-4
  • 16 Gallon Drum

  • $1,070.89
    Ships 12/22/16
    FREE Shipping

    Red Line Oil Synthetic Gear Oil MT-85 75W85 GL-4


    Synthetic Gear Oil
  • MT-85 75W85 GL-4
  • 55 Gallon Drum

  • $3,400.90
    Ships 12/22/16
    FREE Shipping

    75W90 GL-5 Our most popular gear oil, this is the preferred product in nearly all car and light truck differentials, both conventional and limited-slip. 75W90 is preferred for most racing applications. It contains friction modifier which is recommended for limited-slip units. 75W90 Gear Oil can be used in many transmissions and transaxles; however, other Red Line lubricants have better frictional properties for rapid synchronization. Exceeds API GL-5.



    75W110 GL-5 Our most popular gear oil, this is the preferred product in nearly all car and light truck differentials, both conventional and limited-slip. 75W110 is preferred for most racing applications. It contains friction modifier which is recommended for limited-slip units. 75W110 Gear Oil can be used in many transmissions and transaxles; however, other Red Line lubricants have better frictional properties for rapid synchronization. Exceeds API GL-5.


    75W90NS GL-5 This GL-5-type gear oil doesn't contain the friction modifiers for limited-slip hypoid differentials. This makes the transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting. Can also be used in racing limited-slip differentials where weak spring design causes too much wheel spin.



    75W140NS GL-5 A heavier product what works well over a wide range of loads and temperatures, This GL-5-type gear oil doesn't contain the friction modifiers for limited-slip hypoid differentials. This makes the transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting. Can also be used in racing limited-slip differentials where weak spring design causes too much wheel spin.



    75W140 GL-5 A heavier product what works well over a wide range of loads and temperatures, contains additional friction modifiers suitable with clutch-type limited slip differentials. This product is not designed for use in most manual transmissions or transaxles, since the extreme slipperiness may cause synchronizer mesh issues that lead to shifting problems.



    80W140 GL-5 Generally used in commercial trucks which will climb long, steep grades and some racing applications where power is not critical. Generally 0.5% less efficient than 75W90. Can also be used in differentials and transmissions where excessive noise is a problem and limited-slip differentials which vibrate excessively when turning a corner. Exceeds API GL-5.



    Superlight ShockProof A unique product with the viscosity of 75W90 gear oil but lower internal friction similar to that of an ATF. Used when temperatures are not high and when the maximum power output is required such as in stock car qualifying laps.
    Used in low-power road racing transxles like Formula Vee and low-power SCCA Production classes (dog-ring type, generally not sycro application where this product can be slippery).



    Lightweight ShockProof A unique gear oil designed to lubricate racing transmissions and transaxles which see serious loads (not recommended for most syncro-type transmissions). It has excellent low-temperature flow which allows easier shifting when cold. May be used to obtain maximum power transfer in racing differentials which do not see high temperatures. Similar to a 75W140 gear oil, but with the lower internal friction of an SAE 30 motor oil.
    Used in most road-racing differentials with moderate power and dogring racing transaxles.



    Heavy ShockProof A unique lubricant containing a suspension of solid microscopic particles as an extreme pressure agent--unique solid dispersion which cushions gear teeth to help prevent tooth breakage and allows the use of lower viscosities.
    Recommended for heavily-loaded racing differentials and transmissions, Off Road racing and problem gearboxes. The viscosity characteristics allow the lubricant to resist throwoff and provide a film thickness similar to a 75W250 grade, while providing the same low fluid friction as an SAE 75W90.