LIQUI MOLY Super Diesel Additive

Yes. Over time, modern fuels and oils leave behind carbon deposits, resin, and sludge that clog fuel injectors and piston rings, leading to reduced power and poor fuel economy.
High‑quality chemical additives act as highly concentrated detergents. They actively dissolve these stubborn deposits, restore spray patterns in injectors, and return your vehicle’s performance to factory levels.

This depends on the Treatment Frequency of the specific product. A heavy‑duty Curative or Detox additive is designed as a one‑time fix for existing problems (such as rough idling or failing an MOT emissions test) and is typically used once a year or every 10,000 miles. Lighter Preventative additives can be safely added every 3 to 4 fill‑ups to maintain a clean system.

As a general rule, you should avoid mixing additives in the same fuel tank or oil sump at the same time. Different products contain distinct chemical packages that could clash and neutralize each other. It is safer to run one entire tank with a specific additive, refill with fresh fuel, and then use a different additive if needed.

Premium modern additives are specifically formulated to be completely safe for delicate exhaust after‑treatment systems, including Catalytic Converters, Diesel Particulate Filters (DPFs), and lambda sensors. In fact, many fuel additives actively help clean these exhaust components by lowering the temperature at which trapped soot burns off, helping clear blocked DPFs.