I purchased my Explorer Sport new and currently have 172,500 miles and counting. It has been a great car and virtually maintenance free. After 160,miles, I had to replace the brakes, front shocks and ball joints. Changed the shift motor twice and I have some rust on the rear bumper and running boards. Other than that, it is as good as the day I bought it.
The 4.0 DOHC offers plenty of acceleration and driving enjoyment. Comfortable to drive and dependable in the winter.
I noticed it is common for these to have some rust showing on the running boards.