Complete Manual Transmission Drivetrain Fluid Change Kit | 2015+ Subaru WRX & STI

Red Line Oil
Looking for the lowest price?

Give us a call to get the best prices and parts for your build. Or, just call us with a cool racing story...either way we're here.

Phone Call or Text 651-927-4510

Email -

Fits Your:
Expected Delivery by , when ordered within hrs and mins
 Need Help Getting Started?
Call Or Text Our Experts at 651-927-4510


Earn  $2.82 In MAP Rewards!

2015+ Subaru WRX & STI Complete Manual Transmission Drivetrain Fluid Change Kit

Whether you're doing a 30k/60k/90k mileage fluid change, or are swapping out your clutch or differential, make sure you have the gear oil on hand to complete the job! Since most GL-5 gear oils for differentials are too slippery for manual transmissions, Red Line offers these products that ensure proper shifting while providing ultimate wear protection.

Subaru recommends checking and/or changing your drivetrain fluids every 30,000 miles, and if you're a do-it-yourselfer this is what you'll need to get the job done.

NOTE: Make sure to use 75W90NS in the transmission/front diff and 75W90 in the rear diff. 75W90 GL-5 is not designed for use in most manual transmissions or transaxles in passenger vehicles, since the extreme slipperiness may cause synchronizer mesh issues that lead to shifting problems.


  • 75W90NS GL-5 is designed for transmissions and transaxles - helps to slow synchros for easier shifting across a broad temperature range
  • 75W90 GL-5 contains additional friction modifiers for suitability with clutch-type limited slip differentials - for most LSDs, no additional friction modifiers are required
  • Excellent for high- and low-mile transmissions
  • Improved copper corrosion protection to prolong synchro life
  • Non-corrosive formula, safe for use with all synchro materials


  • 2015-2021 Subaru WRX and STI w/Manual Transmission (VA)
  • 2022+ Subaru WRX w/Manual Transmission (VB)

    What's In The Box?

    • 5 Quarts - Red Line 75W90NS GL-5 Gear Oil for the transmission and front differential
    • 1 Quart - Red Line 75W90 GL-5 Gear Oil for the rear differential



    • No Warranty

    Customer Reviews

    Based on 1 review
    Javier Ponce
    Decent Oil

    I've only put like 1k miles on it so far but honestly I feel no difference in ease of engagement in gears. But who knows if my transmission and rear diff feel any difference.