tried few bottle s of power service, in van , pickup and the benz diesels. definetely saw a increase in fuel economy in all 4 diesels,.5 mpg at best. less smoke and smoother starts in older benz diesel, and a slight increase in performance, which i d say is more in smoothness of operation in all others.
'12 gmc sierra 2500 dmax slt carbon black.
'12 s350 diesel mb
'10 mazda 6i, for sale
'77 450sl benz, in family since new, sold, still in jersey thou
'91 350sdl benz, 3.5l diesel, 28 mpg
'90 560sel benz