How much oil is there? I was slightly concerned when I took mine off and saw this...
However, I think this was a caused by a combination of me having Shell 0W-40 oil in there and the standard Impreza recirculating engine breather system. I had planned on fitting an oil catch can, but having cleaned the intercooler and changed the oil to 10W-50 the next time I took it off it was completely clean.