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Red Line 75W90 Gear Oil 1QT - Universal
Red Line 75W90 Gear Oil 1QT - Universal

Red Line 75W90 Gear Oil 1QT


Read 3 Reviews | 3 Q&As
Part # 57904

In stock!
Ships within 24 hours
Universal part

Features & Product Details

RallySport Direct is proud to bring you some of the best lubricants in the industry brought to you by Red Line. 


This is the Red Line 75W90NS GL-5 Gear Oil. This is a fully-synthetic GL-5-type gear oil that contains the extreme pressure additives necessary for the ultimate in protection for road cars and racing vehicles, as well as friction modifiers (except NS) for proper limited-slip operation. 



  • Most popular Red Line gear oil with thousands of applications for passenger cars, light trucks, and racing vehicles
  • Contains additional friction modifiers for suitability with clutch-type limited-slip differentials for most LSDs, no additional friction modifiers are required
  • This product is not designed for use in most manual transmissions or transaxles in passenger vehicles, since the slipperiness may cause synchronizer mesh issues that lead to shifting problems
  • Recommended for API GL-5, GL-6, MT-1, MIL-L-2105E, SAE J2360, and Chrysler spec MS-9763
  • Suitable replacement for a differential calling for an 80W90 or SAE 90 gear oil



  • Fully-synthetic formulas created from polyol ester-based stocks that offer excellent lubrication under extreme conditions
  • Ester base stocks and friction modifiers (except NS) provide additional slipperiness to lower operating temperatures by reducing the sliding friction in hypoid gears
  • High viscosity index (VI) to provide relatively constant viscosity and film thickness with varying temperature change 
  • Superior shear stability and reduced oxidation compared to other synthetics and conventional gear oils 
  • Exceeds API GL-5 specifications
  • Engineered to provide the highest degree of protection and improvement of differential efficiency for better mileage, longer drain intervals, and less wear


    Brand: Red Line
    Class: GL5
    Friction Modifier: Yes
    Type: Synthetic
    Volume: 1 qt
    Color: Yellow
    Mfgr. Warranty: No Warranty
    Condition: New Product
    Return Policy:



    3 Reviews
    2.3 out of 5 Stars
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Stars
    Customer Photos and Videos
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    Works good in 2002 wrx 5 years ago
    5out of 5stars

    This fluid works great in my 2002 wrx. Don't listen to the people reviewing this who put this i there sti rear dif. The STI has clutches that Wes doesn't so the STI requires a different type of fluid
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    no good 9 years ago
    1out of 5stars

    i got the same metal grinding sound in my 06 sti i am going to change it to motul and hope the same doesnt come from it!
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    2 of 2 people found the following review helpful
    Not too sure. 9 years ago
    1out of 5stars

    I recently changed the fluid in the rear differential on my 2006 sti from the OEM fluid to this Redline 75w90 fluid. Initially there seemed to be no difference, but after 4 or 5 days I began to hear a metal on metal sound coming from the rear differential. After 7 days I couldn't stand the sound any longer, so I replaced the fluid with OEM fluid from the dealership. I don't know if the fluid hurt my LSD, but just to be safe I will keep the fluid OEM.
    Was this review helpful?


    • Q: red line 75w90 gear oil  Guillermo3 years ago

      hi I have a 2014 Subaru sti hatchack I was wondering what this rear diff oil would it be okay to use?
    • Q: Flywheel change   jdsmith1231256058 years ago

      I'm changing my flywheel in my 06 wrx and putting in an ACT streetlight flywheel what's the best gear oil to go with
    • Q: is it ok for my diff  wrxridehawaii9 years ago

      Hi is this gear oil going to be ok in my Diff(04wrx)? or am i going to have problems like the guy with the 06 sti and his diff?
      • 1 of 1 people found the following answer helpful

        A:  yeah this should work great, the WRX uses a viscous LSD where the STi uses a mechanical unit. While I have never seen any problems in an STi differential, I have used this personally in several of my WRX rear diffs and I love it. Thanks. :)

        Rick C. @ RallySport Direct 9 years ago  
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    This Part Fits

    Universal Product
    This item is non application specific.
    Please verify compatibility before purchase. May require some modification for proper installation.