Checking/topping up oil level in automatic transmission (AISIN GA8G45)

Precondition 

Vehicle in horizontal position.

• Shift the selector lever to the "P" position.
• Secure vehicle to prevent it rolling.
• Connect diagnostic system.
• Release oil filler plug (1)  with Torx T55.

  Courtesy of BMW OF NORTH AMERICA, INC.

• Add automatic transmission fluid (automatic transmission fluid has been drained off): 
• Release oil filler plug (1)  from engine compartment.
• Release the banjo bolt (2)  on the bottom of the transmission.
• Fill up automatic transmission fluid at the oil filler plug (1)  until oil leaks at the banjo bolt (2)  .
• Start engine and run at idle speed.
• Check if the automatic transmission fluid is leaking on the banjo bolt (2)  .

  Courtesy of BMW OF NORTH AMERICA, INC.

• If no automatic transmission fluid is leaking on the banjo bolt (2)  , fill up the automatic transmission fluid on the oil filler plug (1)  .
• Actuate the foot brake and shift through all the gears "P" to "D" twice for more than two seconds at idle.
• Shift the selector lever to the "P" position.
• Check again whether automatic transmission fluid is leaking on the banjo bolt (2)  .
• Check the temperature of the automatic transmission fluid with the diagnostic system.
• Increase temperature of automatic transmission fluid to 35°C to 45°C.
• Top up automatic transmission fluid until it flows over.
• Replace sealing rings.

  Parts:  Sealing ring

• Screw in the oil filler plug (1)  and the banjo bolt (2)  and tighten it.
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Oil filler plug to transmission housing
  M14 Replace the sealing ring.	tightening torque	45 Nm

  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Banjo bolt in oil drain plug
  M6 Replace the sealing ring.	Tightening torque	8 Nm

• Check oil level (transmission oil temperature must be between 35°C and 45°C): 
• Open the oil filler plug (1)  .
• Slacken the banjo bolt (2)  .
• Start engine and run at idle speed.
• Unscrew the banjo bolt (2)  .
• Check if the automatic transmission fluid is leaking on the banjo bolt (2)  .
• If no automatic transmission fluid is leaking on the banjo bolt (2)  , fill up the automatic transmission fluid on the oil filler plug (1)  .
• Top up the automatic transmission fluid until it overflows on the banjo bolt (2)  .
• Actuate the footbrake and at idle shift through all the gears "P" to "D" twice for more than two seconds.
• Shift the selector lever to the "P" position.
• Check oil level again.
• Replace sealing rings.

  Parts:  Sealing ring

• When oil flows easily from the banjo bolt (2)  , tighten the banjo bolt (2)  and the oil filler plug (1)  .