diesel guys

this may sound crazy but this is what i was told by a 30yr tech..i own a dump truck and was buying the lucas never seen a diff. talked with the tech ask him what to use he said lucas is a wast of your money..use some trans fulid every time you change your fuel filter...now i pour a hole qt in my filter it smokes just a little but it seems to me that it gets a little better fuel mil. and it runs clean and better...now as for as a daily driver truck put a little in the filter and try it ....not in the tank cause it will smoke a little until its all gone... hope this helps