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					Originally Posted by  RETed
					 
				 
				Yes, it's possible that back-pressure through the oil drain line can cause oil to leak past the turbine compression ring back there... 
...but we're talking about a stock turbo using the stock oil drain line, right? 
Unless you messed up a gasket or went bonkers with the silicone RTV, that's almost impossible...
 http://turbocharged.com/catalog/parts_list.html
Part #16 is the turbine compression piston ring that needs to be replaced. 
Since these rebuild kits are relatively cheap versus the labor costs, you might as well get the entire turbo rebuilt.
 
-Ted  
			
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lol no, not stock turbo and not stock drain line...