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I wouldn't worry about it unless there is an issue. Do not know why they changed it, Our first one we tried to do; Subaru sent us the wrong part. We do not service them anymore unless requested. Do not need a car setting apart for a week as we try to match a part that isnt dirty...

I have an 08 with 118K miles. I am extremely proactive with the car. I haven's changed the filter.

If it were your car would "you" change it Sackett? (I am not looking for guarantees that it won't cause me a problem). Sometimes I take the path of "if it ain't broke..don't fix it)