I stumbled upon the DSE website that claims with an additive you can use WVO without modifying anything on your diesel.

I have a '95 Powerstorke Diesel and am interested in WVO instead of paying 3.50 a gallon for diesel in WA state.

My buddy runs straight filtered used tranny oil but he's a Powerstroke Diesel mechanic at a local Ford dealership and has access to it. By the way he's run it for two years with no problems in a '95 PS diesel. In winter he starts the truck with diesel and shuts it down with diesel though.

I just wondered if anyone used the DSE additive instead of heating the oil? Is it really snake oil?