Blue smoke at idle?
 

I recently purchased an 95 Impreza Turbo 2000 Wagon back at the beginning of March and all has been fine until just recently (last 2 weeks), Once warm and at idle the cars starting to pass blue smoke out the exhaust. It started as an intermittent problem and only did it every so often but now starting to get more and more regular i want to do somthing about it. It never does it when driving, on or off boost or when cold either if that makes any differance. I've taken the topmount and all induction pipework off and there is only a fine mist of oil covering the inside of the pipes/cooler.

I've used the search button before anyone starts and Ive read a fair few posts on this subject, It leads me to conclude its turbo oil seals but i'd just like my assumptions verified if possible?

Also if this is the case what turbo is fitted so i know what to replace it with, further usage of the search button brings me to believe its a td05? would that be right?

Thanks in Advance
Mitch :(