I use Stanadyne performance summer or winter mix depending on time of year. Their "lubricity" formula is like extra strength lubricity and recommend for winter blends/diesel #1 both of which I don't get much of where I live. Not sure any of this is requisite but it's cheap insurance. Some stations may have upgraded diesel that may not require this but I'm no expert on that so I buy the cheapest diesel I can get and throw in some of this. I buy larger quantities off the internet and pour 7oz or so into smaller bottles ready for my typical 20ish gallon fill-up. The summer mix is a little cheaper, why I switch to that when temps don't demand more.
Lots of these products are similar. I buy Stanadyne cause it's been around a while. Others may chime in there are better ones though, I've seen where some offer better lubricity. Hope that helps.
2018 King Ranch, 3.0, Black and gray two tone