Liqui moly 5120 super diesel additive 250ml liqui moly 5120 p this super diesel additive 250ml from liqui moly contains a mixture of agents with cleaning dispersing material protection and cetan number increasing properties formulated for today s engines fuels and running conditions p p provides better lubricity for diesel fuels low in sulphur due to the increased ignition performance the fuel shows better combustion behaviour when the engine is cold and the pollution from odours i