My Forrester 2.5XT is losing oil at about 1 oz. per 100 miles. I've read some threads about dealers overfilling at oil changes. Is it possible this is to compensate for the oil usage? I'm using Penzoil 10W-30 and have changed oil at 3000 and 6700 with approximately 8000 on the car at present. Anyone have a solution or suggestions about normal Subaru oil usage?