The 3126 Cat has been a great motor for me. My one truck got 720,000 miles on a 3126 before we had to do an Inframe at R & R engine in Akron, Ohio. Now the 8.3 Cummins we have had more things go wrong with it. The fuel pump was $2700 to replace. A fuel pump in a Cat is less than $300.00. Now if...