Like a lot of others posting on this site I have not heard anything about additives for newer diesels using ULSD. However for older trucks, like my 04 dodge, I do use an additive. This was based on what I read on The diesel place web site, with a test of additives: the link is
http://www.johnfjensen.com/Diesel_fu...itive_test.pdf. Although it is rated No. 10 I use Diesel Kleen, as it can usually be found at Walmart and most truck stops. Does it help? I only have 50K on the truck, so only time will tell, hope this info helps anyone who might look at this thread.
Lee