One problem related to engine oil leaking has been reported for the 2006 Subaru Forester. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Subaru Forester based on all problems reported for the 2006 Forester.
When I took my car in for it's 90000 mile service, I was shown that there was oil leaking for the drivers side head gasket. I was informed that this is a common problem for Subaru Foresters from the late 1990s thru 2009. Appears to be a faulty design, which Subaru has not owned up to. My online search located a large number of complaints by Subaru Forester owners on this design flaw.