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04 Forester X, MT
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probably an oil leak. could be something as simple as valve cover gasket or other fairly easily replaced seal, or something as major as headgasket oil leak (although 99 is more likely to either leak internally or leak coolant external). could also be the plastic "oil separator plate" on the back of the motor that requires removal of either engine or trans to replace. could be grease from a torn CV boot getting on the exhaust.

just have to take off the plastic under pan and take a look. if things are too dirty clean them up good, drive a little, and look again.
 
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