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Kthnxbye Racing

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

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

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Red Line 75W90NS GL-5 Gear Oil

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
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