ACDelco Diesel Fuel System Treatment Plus is a one-tank fuel injection system treatment formulated to treat diesel fuel systems in one application, reducing deposits and restoring engine power. It is effective on nozzle and internal injector deposits, helps restore power lost due to fouled injectors, and helps restore engine performance. ACDelco Diesel Fuel System Treatment Plus is a high quality chemical for your vehicle and is manufactured to meet your expectations for quality and function from ACDelco.