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I don't know whether this is necessary to replace it, but the car has 109,000 miles on it, and it's never been done.
Check your owners manual. My info says either 105k or 120k. Need specifics of engine to know for sure.
Q&A > Subaru > 2005 Subaru Forester
Q&A > Subaru > 2001 Subaru Forester
Common Problems > Subaru Forester
Q&A > Subaru > 2002 Subaru Forester