“I bought a 1981 Mercedes diesel a few years ago. I suspect it had been sitting for a long time. While driving it over 70 mph the engine started losing power and eventually stalled out. After some consideration I figured that at that speed debris or algae must be blocking the tank filter. I limped but home doing 64 mph. My mechanic recommended removing, draining and cleaning the tank. For whatever reason I decided to give SeaFoam a try. I used two bottles and then took it out on the highway to see if the car would still have problems driving over 70mph. No problems whatsoever. No problems since then either. I became a customer and believer. Thank you SeaFoam.”