Is there a difference between a dot 4 and dot 4 plus? Can I use either or should stick with the dot 4? Where I’m from there isn’t much options for the dot 4 fluid. I know that there is a generic penzoil dot 4 and also a dot 4 made for American cars and also a dot 4 for Honda and Acura etc. That was the selection from Canadian tire. If any of those won’t do perhaps I will have to go to Mercedes to get one from there??