A Tale of Two Injector Sets

[JMBT]

I don’t know whether it is helping the injectors, I know it adds back in some of the lubricity that the new fuel has removed, so it should be helping, right? I have heard not to run it in a tier 3 or tier 4 motor because it plays havoc with the emissions system. Are you demandated or pre- dpf? If not I would be interested to know, if it is ok for newer motors? My brother runs it in his old Cat so I am curious. Thanks.