I have an 06' Dodge and drive it approx. 5,000 miles a year. I change my oil between 5,000 and 7,500 miles depending on what percentage of those miles were tow/haul miles. For about the last year and a half, I started adding a fuel additive and the truck runs noticeably quieter with the additive, which I'm presuming is better for my fuel pump and injectors. Opinions are what they are but it is very difficult to call someone's personal experience false or misinformation. As diesel owners, we can all share what we've experienced or done for maintenance.