I found this interesting. My buddy works for an excavating company and their mechanic was replacing a fuel pump on a powerstroke as a favor for a friend last night. He called me to tell me about the disclaimer in the box with the new pump. It said "the warranty on this pump will be void unless a fuel additive is used." I run Diesel Kleen year round and now I guess I will continue to do so.
Just thought I would share this interesting fact with you all.