Opti-lube XPD and Summer. Ran a couple different brands and ended up with this one. Can’t really give a reason other than the claims of better lubrication. Ran it in my Colorado 2.8 due to the possible injector failures. No issues in 46k miles.
i have been very happy with stanadyne but i have not worked with anything else. i picked it because it is approved by everyone from john deer to VW i could not find a manufacture who did not recommend it. i have heard great things about a number of brands and most will work to help replace what the EPA is taking out of the diesel.