MOTUL 110089 - Motul Diesel System Clean Motul Diesel System Clean is a cleaner additive design to be used in all types of Diesel injection systems, with indirect or direct injection, naturally aspirated or turbocharged, with or without DPF (Diesel Particulate Filter) and with or without SCR (Selective Catalyst Reduction) systems. It effectively cleans dirt and clogging throughout diesel system, and provides a perfect lubrication during cleaning, preventing removed micro-particles from depositing, as well as diesel fuel oxidation and micro-organism formation.