Changing the oil on our headstock... Machine is new to us. Manual clearly states the capacity at 50 liters. We drained about 12 liters from her. I filled with 20 liters. When power is off and oil pump is not running the oil level is clearly off the sight glass full. When the pump is running the oil level is pulled down some and shows about 90% full on the sight glass. Any chance someone has a TL-5 and can confirm for me how much oil they are using? Thanks