As the very happy owner of a 1994 Legacy with 211K I know that I'll be driving this car for several years more.  However, just in case...I've been thinking about a potential replacement.  I've recently heard about the early demise of many a Subaru engine and my mechanic told me today (don't worry, it was only an oil change) that it was a head gasket problem.   
  
My web searching has not come up with further information about what years and models in which this was a problem.  It seems obvious that Subaru recognized it and (hopefully) fixed it.  Anyone have any word on this? 
  
Many thanks.