If it really has low mileage that helps. The 3.0 Mitsu was known to have valve guides fall down in the head causing oil control issues. Pulled many sets of those heads in the day. If it's a 4spd auto it might be a A604 which were also problematic is the early years.Pulled many of those also.Otherwise that 3.0 was a good runner with plenty of power in those cars and when the 604s worked,they worked well.A good road test is in order...get it good and hot..watch for oil smoke from exhaust and ensure proper trans operation. The 604 had some lip seal issues that failed when hot.