4 stars only because it doesn't have its own funnel so you can put it directly in the tank

Although I use preventive cleaners, I did not notice any difference with this one. The packaging is inappropriate as you can only use it with a fuel funnel. The consumption was a bit high compared to other times and other cleaners. Approximately the same routes under the same conditions. Generally, Mannol products are good but this one seems to have failed.

Out of the four that I recently tried on various engines, this was the only one with which I did not notice any improvement. Its packaging is also unsuitable for a car's fuel tank, the nozzle is too short and does not reach to open the fuel tank cap.