Lucas Oil Synthetic Oil Stabilizer is light enough for an import - Tough enough for a semi. Use in new equipment which requires synthetic oils or any equipment that needs enhanced performance. It can also be used to protect new and used Heavy Duty and High Performance transmissions, gear boxes and engines. Controls heat and wear in motorcycles, air-cooled engines and all drive train components. Reduces friction for increased power and MPG. In Ford Powerstrokes we suggest one quart of Pure Synthetic Oil Stabilizer per oil change.