Part of the certification REQUIRED for any new diesel fuel sold (changed manufacturing process) is a test for wear/scuffing of injector fuel pumps. Additives are added to the fuel as required at the refinery to meet this important characteristic. MBZ injections pumps ARE NOT subject to wear from low sulfur fuels since the driving parts are lubricated by engine oil. The plungers do not wear since there is no metal-to- metal contact ever.

The MBZ injection pumps ARE sensitive to trash and water in the fuel. Buy good fuel, keep it clean and dry, and at least once a year use diesel doctor to keep water and bacteria out of your fuel and clean injector nozzles.