My Renault Megane 1.5 diesel with 330,000 km is treated with this product. after a few hundred km it was clearly noticeable. The engine responds much more directly and the soot emissions are considerably lower. I am very satisfied now that 2000 km further the result is that the combustion is much better and my partner said: what happened to the car, it is now much more direct. I ordered a new can to repeat the treatment once more before the MOT