not at all !
only anti gel when needed .
Oil company's spend million of $'s every year to develop the best cost effective brand they can ,and the oil's we have today are perfectionally engineered for the modern diesels engines ,or engine manufacturers would have demands those additives to be used. actually some additives can really hurt an engine .
even after many weeks in the diesel lab ,i have never seen a dirty injector .i think that those injector cleaners can really damaged a good injector ,by cleaning the system ,and pushing the dirt into the injector at 30,000psi. without them ,the dirt stop at the filters.
i do get my coffee with one sugar and one milk tho'w.