Nulon Diesel Injector Cleaner is a powerful multi-functional chemical package formulated to clean all diesel engines including common rail injectors and combustion chamber deposits fast. It improves fuel system efficiency and economy, reduces black exhaust smoke and makes cold starting easier. Suitable for all diesel fuel including bio-diesel. Benefits Cleans dirty injectors in one tankful Cleans Internal Direct Injector Deposits in Common Rail Diesel Engines Suitable for diesel engines including common rail Helps clean entire fuel system Improves fuel economy Reduces black exhaust smoke Reduces exhaust emissions Protects fuel system against corrosion Helps prevent algae formation