no problem, That is why you need to refill the sump and turn the wheel back and forth this get the air out or 99% of it. You will get some air but that will come out very quickly and it gives you a complete flush. If you do not turn the steering wheel you will get a lot of froth in the pump.
2005 320 CDI
2006.5 VW Jetta TDI
1991 560SEL (179000 Sold)
1972 280SEL 4.5 ('The Lead Sled' 320000 miles when sold.)
1972 220D (225000 when sold)