Pressure oil

I want to thank everyone. Problem solved once the tank breather tube was cut, as stated in the Rotax Bulletin, after three hours of training flight in the Tecnam P92 with the oil tank level at the maximum, I have not lost a single drop of oil. Thanks to you, I have ruled out possible obstruction of the tube from the crankcase to the oil tank return. Thank you all
Alejandro Zapata

Spain