Chrysler has made some pretty solid I-6 engines over the years. Remember the "Slant 6" in the old Chrysler cars...you couldn't kill them. Then the Jeep 4.0L I-6 was another really great engine. What I like about I-6 engines is they are really smooth and require no counterbalancing. Cylinders fire every 120 degrees of rotation. Super smooth engine designs! The only other engine configuration that smooth is a V-12, which is basically two I-6s connected at the crank.