sorry oil question (though not your normal)

[Meatwagon]

Ok so I check the oil as per manual (2010, 1200gs) sight glass says lets say half full ,so I release the oil filler plug (feel hear) there’s a vacuum check sight glass now its three quarters or more is this the norm?
Any advice appreciated

 

[snerkler]

Ok so I check the oil as per manual (2010, 1200gs) sight glass says lets say half full ,so I release the oil filler plug (feel hear) there’s a vacuum check sight glass now its three quarters or more is this the norm?
Any advice appreciated

Err what's this say in english? Are you saying when you opened the filler cap there was a vacuum release and then the oil in the sight glass raised by a quarter? If so I've never had this on mine.