Not sure it would evaporate out of there.Probably been made into a whole wedge of beer cans by now then!
Looks quite fresh that oil, would expect less if it had had 30k of new turbo to evaporate. Might be a good sign. You going to whack it all back together with new shells and see if any more builds up after cleaning it? Fair old bit of legwork been done over the last few weekends pulling it all apart it seems, fingers crossed this'll be it for a good 150k!
I'm considering having the valve guides changed while the head's off?
Then put it together and run it with the turbo playing in to a catch can