I have been using it for four years and it does the job it claims to do very well. I use it every 5000km and on trips. The difference in engine performance is noticeable from the first 100km. I recommend it

It does the job. Even with half a bottle in a 42-liter tank, I clearly saw the engine working more smoothly, especially during start-up and idle, as well as pulling about 10% better at lower RPMs. If you use regular diesel, it's a good solution every now and then... It increases the cetane, as for the rest of the claims, it might possibly clean the injectors/valves somewhat.