i think there are too many factors to estimate.....i know if the previous owner of the car didnt take his car for regular oil changes (math: 110,000mile/11 years=10,000miles per year) ...so give or take 3 oil changes a year...so if he wasnt doing that.....start subtracting mileage
I have a 93 325 with 135,000. I have owned it for 8 years. In the last 3 years I have fixed the air conditioning , front heated seats, windshield wiper motor, replaced brake pads/rotors, muffler and now I have a problem with the on board computer reading the wrong outside temperature. It has been an awesome car though.