The only lubrication within diesel fuels systems is the diesel fuel itself. In 2006 federal laws required that all fuel manufacturers severely reduce the lubrication in diesel fuel by drastically reducing the amount of sulfur allowed in diesel fuel. The ability of diesel fuel to lubricate critical parts such as fuel injectors and pumps is extremely deficient and dry. This challenge is not limited only to 'diluted' winter fuel, but diesel fuel lubrication is now required all year long. Diesel injectors often have a higher failure rate and shorter lifespan due to their more extreme operating conditions. When these injectors fail, it can lead to a cascade of performance issues, increased emissions issues, and even engine damage. The transition to ultra-low-sulfur diesel (ULSD), driven by stringent environmental regulations, has made supplementary lubrication mandatory to prevent premature wear and component damage. DFL  Diesel_Fuel_Lubricant  has incorporated their proprietary ProMAX Extreme formulation into DFL  5-IN-ONE diesel conditioning formula. By adding DFL at the suggested mix ration of 500:1 the level of lubrication in diesel fuel is greater than pre 2006 lubrication levels. ProMAX extreme formula is found exclusively in DFL Diesel_Fuel_Lubricant