In my opinion the GM 4.8, 5.3, and 6.0 are some of the most reliable gasoline engines ever made. The 5.0 and 5.8 Fords are also great engines. It's to early to say how the new V6 engines from Ford are going to last. I have a 2015 Transit 250 with the 3.5EB, I love it, amazing power, good MPGs I...