One problem related to engine head gasket leaking has been reported for the 2003 Subaru Forester. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Subaru Forester based on all problems reported for the 2003 Forester.
Took Forester into Subaru dealer for 3k oil change; was told that almost all of my anti-freeze was gone and that the head gaskets were leaking, needing replacement at $1500. Miles on vehicle: 78k, purchased 6/02 new, all maintenance performed at dealer per schedule. At this time, I'm looking into websites to identify if this is a problem that's systemic with this vehicle, and looking into alternative sources to fix vehicle to reduce cost.