Visually check transmission assembly surrounding area (oil seal, drain plug, filler plug, transmission case, etc.) for smears and leakage of transmission oil.

• *1: When the oil does not drop
  
• *2: When the oil drops
  

Oil smears/leakage status from transmission assembly		Required operation	Reference
Smears*1	Smears from each part on the transmission assembly	Use part cleaner or the equivalent to wipe out smeared oil. Then, check for oil leakage.	—
Leakage*2	Mating surface between oil pan and case	Check the seal surface condition. Replace the oil pan gasket only if there is a non-standard condition. Check for oil leakage.	Exploded View
	Park position switch mounting surface	Check the mounting surface condition. Replace the plain washer only if there is not any other malfunctioning condition. Check for oil leakage.	Exploded View (GT-R certified NISSAN dealer)
	Heat exchanger & bracket mounting surface and heat exchanger mounting bolt	Check the seal surface condition. Replace the O-ring at the location where the oil leakage occurred if there is not any other malfunctioning condition. Check for oil leakage.	Exploded View (GT-R certified NISSAN dealer)
	Front oil seal	Check the oil seal mounting surface and sliding surface condition. Replace the front oil seal only if there is not any other malfunctioning condition. Check for oil leakage.	Exploded View (GT-R certified NISSAN dealer)
	Drain plug	Replace the drain plug. Check for oil leakage.	Exploded View
	Filler plug	Replace the filler plug gasket. Check for oil leakage.	Exploded View
	Transmission harness connector	Replace the transmission assembly.	Exploded View (GT-R certified NISSAN dealer)
	3rd-5th check pin Idler bolt Plug	Replace the plain washer or O-ring. Check for oil leakage.	Exploded View

Remove the filler plug, insert a finger into the filler hole, and judge the oil conditions from the transmission oil applied to the inside of the transmission case.

■ CAUTION ■

Be careful not to cut the finger with edges.

Transmission oil status	Possible cause	Required operation
Varnish-like condition (It is as thick as varnish).	Clutch is burned.	Change the transmission oil. Check the transmission assembly or any other parts on the vehicle.
Milky or cloudy	Water is mixed in the fluid. Example: Inflow of engine coolant by internal explosion of heat exchanger Inflow of water from breather by flood, etc.	Change the transmission oil. Check for flooded area.
A large amount of metal particles are contained in the fluid.	Sliding portions in the transmission assembly are excessively worn.	Change the transmission oil. Check the transmission assembly operation for any malfunctioning condition.