I need opinions on the Ford V-10 6.8 liter engine. I bought a step van that was advertised to have a 5.4 Triton with 110,000 miles. It is a 2003. I was just informed it had a 6.8 instead. I have van with the 5.4 and it has been good. I was told by a friends mechanic I could get 700,000 miles out of the 6.8. The price of the vehicle is not changing.