I have had several diesel pickups, (2001.5 Cummins 5.9, 2003 Cummins 5.9 HO, 2006 Powerstroke 6.0, 2015 Powerstroke 6.7, 2016 Duramax) and never added any diesel fuel additives at all, ever. No engines problems at all from any of these engines from any of the various manufacturers. Matter of fact, the 2006 F-350 Superduty 6.0 was the most trouble free truck I have owned to date.
I do have a couple diesel farm tractors. Last year on a whim I got some additive and put it in the tank of the bigger tractor. Immediately after I fought problems for months in the fuel filters and fuel pump screens with diesel algae. I mean y this the tractor quir running and I would have to work on it. The other tractor, 8 years older, I didn?t put in the additive and it is still running like a top. It?s a 1999 model. Not giving advice, just my experience.