Next Oil Change

[Veemanzero]

Motorcycle oil, if its not a supersport spinning at up to 13000 revs and manufacture says semi. Use 10-40 car oil. Same shit different label. Never had a problem. Frequent changes are Important to avoid the shearing effect.

[northern]

110ºC or 120ºC ? I´ve read, don´t know where, it starts to run at 120ºC. Don´t know when it shuts down. Anybody knows ?

According to GSX1400 service manual:

Cooling fan thermo-switch operating temperature
Standard:
(OFF→ON): Approx. 120°C (248°F)
(ON→OFF): Approx. 108°C (226°F)

[Jeykey]

Yep, got ya ! 

[Veemanzero]

I think your wasting your time, you won't get a litre out of the cooler. I had to disconnect mine to replace the o rings. And not much came out. Besides theres a litre sat in the head that you will never get out. I think your better off changing the oil more frequently or if money is not a issue and you want to be super sure flush it with some cheap 10/40.
Just saying