I think there seperator pipes but iam not sure, this pipes connect the turbo to its little air filter I think its that and there is also a pipe that reaches the top part of the motor that one os also cranked with oil.
its very common for a diesel to leak oil from its turbo/intercooler pipes,its nothing to worry about unless its leaking heavy amounts of oil.the oil comes from the diesel fuel which is naturaly oiley it builds up in the pipes and forces its way out.
Cool then, I just got worried because I havent cleanded my engine for some time now and opened the hood a couple of days ago the first thing a looked at was the oil on ever pipe so I got slightly concerned.
JB is human after all. I like how he assumes we all have a diesel engine. Well I suppose to be fair most 155s sound like diesels now. From browsing the alfaowner site it would appear the variator plague has now hit the clear indicator lens 147 boys. How old long before we get alfa147.com , i suppose when the young owners get into there 30's like us and there car is not worth owt any more and they get brave with the socket set.