I know there are a thousand posts on this, but I still don't see how the increase in efficiency due to addition of Water Wetter could be anything but incredibly marginal ... marginal, too, in the sense that it simply doesn't matter ...
Is there an independent test result that someone can share with me?
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg