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Comments
I can't remember if the legacy went to the FB engine in 11 or 12, but I think it was 12, which would mean they probably want you to change it sooner than 100K.
It certainly won't hurt anything to change it at 24,000 miles, but you're not necessarily gaining anything either except the peace of mind.
2011 Forester = FB25
2012 Impreza = FB20
2013 Legacy/Outback = FB25