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Home >> Subaru >> 2019 >> WRX STI Limited >> Repair and Diagnosis >> Transmission >> Manual Trans >> Manual Transaxle & Differential (TY856) >> Transmission Gear Oil >> Replacement

Transmission Gear Oil: Replacement

  1. Lift up the vehicle.
  2. Remove the filler plug.
    G13261760Courtesy of SUBARU OF AMERICA, INC.
  3. Remove the two drain plugs (oil pan side, clutch housing side), and then drain the transmission gear oil completely.
    CAUTION:
    • Immediately after running the vehicle or after idling for a long time, the transmission gear oil will be hot. Be careful not to receive burns.
    • Be careful not to spill the transmission gear oil on exhaust pipe to prevent it from emitting smoke or causing fires. If transmission gear oil is spilled on the exhaust pipe, wipe it off completely.
    NOTE:
    • Tighten the drain plug of the transmission gear oil after draining the transmission gear oil.
    • Always use a new gasket.
    • Use TORX® bit T70 to remove and install the drain plug on clutch housing side.

    Tightening torque: 

    Oil pan side 

    50 N.m (5.1 kgf-m, 36.9 ft-lb)

    Clutch housing side 

    70 N.m (7.1 kgf-m, 51.6 ft-lb)

    G13261761Courtesy of SUBARU OF AMERICA, INC.
  4. Pour transmission gear oil to the bottom end of filler plug.
    NOTE: Carefully refill transmission gear oil while checking the level. Excessive or insufficient oil must be avoided.

    Recommended gear oil: 

    GL-5 (75W-90) or equivalent

    Transmission gear oil capacity 

    4.1 L (4.3 US qt, 3.6 Imp qt)

  5. Check the level of the transmission gear oil.
  6. Using a new gasket, and tighten the filler plug.

    Tightening torque: 

    50 N.m (5.1 kgf-m, 36.9 ft-lb)