My dad has 2 super duties. The work truck is a 2000 250, 7.3, auto with 367000 miles. the second is an 06 250 king ranch, 6.0, auto, 90000 miles. The 6.0 has left him stranded several times the last week in colorado and again in new mexico. He is home now and ready to trade it in. We really like the 7.3's dependability but i've been trying to talk him into trying a duamax/allison truck. Are there any certain years of the 7.3 or the duramax to stay away from?