Let me tell you a story. Hope you have a minute.
I have a 2004 forester xt. My OE turbo, a TD04, went due to a PO011 and oil starvation. I dove in and started researching everything I could find on the subject. I spent over a month pounding the Google pavement, talking to local tuners, and tune shops all over the US. Here is my story.
First off I found the following forums very helpful.
http://store.forcedperformance.net/merchant2/merchant.mvc?Screen=Info_SubaruOil
The PDF's are helpful.
http://turbolabofamerica.com/turbo-warranty/#sthash.fl3d6sH2.dpbs
This goes into some good detail on what happens with oil starvation cause knowing the cause wqill help you avoid all these problems.
http://forums.nasioc.com/forums/showthread.php?t=1218459
NASIOC Turbo FAQ
http://www.mysubie.com/faq?id=19
Unabombers entire site in fact. Helped a lot!!
http://www.iwsti.com/forums/2-5-liter-litre-factory-motor/101927-turbo-oil-feed-avcs-line-replacement.html
A great write up of ALL three banjo bolts containing filters. the most important for the turbo, the on under the turbo on the main oil feed line going into the top of the CHRA!!
Now as for what happened to me. Here are the links to my post on here.
http://www.mainelysubarus.com/forums/topic/15813-turbo-for-breakfast/
After i had purchased the new TMIC, FP Green, UP and down pipe, Gaskets and all the rest of the things that are involved with this type of repair, I was in around $2,700. I had it tuned by Granite state, and they were great. John Is amazing and Id recommend him and his company to anyone. That said, I drove home and after 60 miles this horrible grinding sound emanated from the hood. I pulled her over and checked everything, revved the car, couldn't repeat it. I drove home at a limp. Next day I brought it to a subaru garage and they couldn't figure out the problem. I called GSD, John was there to talk me around what it might be. Turbo oil starvation or metal fragments left over from the old turbos bearings.
See what I learned was that when a turbo goes due to oil starvation, small fragments of the old Journal or ball bearing sets pass into the oil supply. Those small pieces end up contaminating everything in the oiling system. The Oil cooler, the oil pan, the orifices through out the engine, everywhere. When I installed my new FP Green I had done a full oil change, but not a full flush, nor did I remove all off the oil lines and clean them out. So after the tune, while I was driving on the highway at 70 mph, all those particles became caught up inside my journal bearings and already partially clogged old oil lines. After about 60 miles or so, the main line to the turbo finally clogged up. There went my journal bearings and $1400 turbo, just like that. It only took a second for the main shaft in the turbo running 125k+ rpm at 70 mph for those bearings to spin. chewing up the insides of a nice new turbo.
Now my car now sits comfortable in the hands of Mike at Meyagi motors who is, as we speak, installing a used blouch. He is also flushing my entire oil system, dropping my pan and cleaning that out, and changing out all of my oil lines with brand new braided lines. I am also installing a inline oil filter.
Here is the link to jegs, I highly recommend it and so does many of the tuners I have talked to.
http://www.jegs.com/i/Earl%26%23039%3Bs/361/AT230304/10002/-1
And accompanying Union for the filter
http://www.jegs.com/i/Earl%26%23039%3Bs/361/915104/10002/-1
Here is a great read about turbo failure and flushing the oil as a post apocalyptic turbo failure
http://legacygt.com/forums/showthread.php/turbo-failure-wiki-173358.html
So as you see now, we both have had this unfortunate string of events happen to us. I highly recommend that you do the following as I have had to learn the hard way:
1. Replace the old oil lines with new braided lines.
2. Add the inline oil filter to the new lines.
3. Flush the oil. This involves dropping the pan and cleaning the pan of any debris. Clean the oil pick up. re install. Now I have heard of people flushing the oils using cheap oil and a friend. Not sure the proceedure you might want to ask someone who has done it. My car is in Mike's hands and he is flushing mine, again not sure his procedure. You can call him and ask,
4. Switch the oil type. I am using Rotella T6, but there are others, like Total Oil or Subaru syth. are good alternatives.
5. Have a oil pressure test done after all this.
6. Install an oil pressure gauge so you can monitor the oil and make sure everything is running as it should.
7. change change change your oil. ALl of the particulates will not be completely out of you oil cooler, it is impossible to do. Some might suggest getting a new one, everyone I have talked to including Ron, the friend I made during this endevour who works for APS recommends just changing changing changing the oil regularly.
8. Pray. After all of this, you might still run into engine problems down the road and it is a crap shoot. With alittle luck on your side, all of the particles in the oil will be cleaned out and no damage will have come to the engine bearings. So pray.
If you have any questions, please shoot me a text. I can send you all the conversations I have been having with everyone about this issue. there is a lot of information out there and I found that being polite and asking the right questions can prove lucrative.
I hope this helps. And of anyone has anything to correct me on or chime in about please do, This is all just a learning experience for me.
Best of luck.