I'm giving a five star because I have no complaints, but I realistically haven't ran the oil or fuel additive long enough to notice if they've improved anything. The real review will happen when or if I order more in the future
I’ve been using the fuel treatment for almost 3 years. I put it in every time I get gas. The bottle makes this really simple and easy to measure and there is little to no mess. I drive a 2011 Mercedes E350 Bluetec. It has the 3.0L V6 Diesel engine that is also in the Sprinter van. I’m suppose to get 34 mpg on the highway but I’ve been averaging 38. I sometimes get as much as 40 but not all the time. Seems to work pretty well...
Cuts the startup tick in half on my wife Subaru not to mention does wonders for my 7.3 and everything else I own