Motorkote Fuel Optimizer was formulated to off-set the diminishing quality of fuel including phase separation. Once phase separation occurs water builds up in your tank. MotorKote Fuel Optimizer Removes water and moisture and other harmful deposits that rob your injectors of power and performance allowing for a cleaner burn. Helps your fuel burn cleaner and hotter for better fuel economy and performance. Use in the fuel tank in both gas and diesel engines.