DWD2 Clean Metal - Metal Conditioner and performance Motor Oil Additive: DWD2 Clean Metal Features nano-technology that penetrates the microscopic pores of the metal and acts as a cushion between moving metal parts in your engine. DWD2 motor oil additive can penetrate the surface cracks of the metal. Typical motor oils can only withstand a limited amount of pressure and heat. Add Metal Conditioner to your engine and help reduce heat and friction, and allow your engine to run at peak efficiency!