Thanks for the input guys
The two things that worries me about this situation are:
1- why engine didn't dump any oil in the air filter within the last 3 years since I own the bike
2- I always fill up to NEAR MAX LEVEL when changing oil and filter, never had to drain any or add any
As I mentioned I'll drain a bit more oil during the weekend to get the level close to the minimum and then see what happens.
If that doesn't help I'll ring the mechanics