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I tend to do the changes myself or at a local garage so if I ran into a similar issue I couldn't provide receipts with date and mileage but I ALWAYS buy the filter from a Subaru dealer and never more than a day before the change is done. That way I figure they at least can dig up a record of that and see the date. Other than a stretch where the car didn't get used much due to unemployment the intervals have been pretty consistent at about 10 weeks between changes.
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