Liqui moly 5128 diesel engine system cleaner 300ml liqui moly 5128 p align left this diesel engine system cleaner 300ml from liqui moly has been developed to remove and prevent deposits in the fuel system and the combustion chamber making it suitable for all diesel engines including common rail and pump injectors as well as in vehicles with and without a diesel particulate filter simple to use and can be added directly into the fuel tank p liqui moly 5128 diesel engine system cleaner 3