CD-2, a product of Turtle Wax, offers 3 exceptional performance products. CD-2 Premium Stop Leak is guaranteed to stop oil leaks. CD-2 Oil Detergent replenishes detergents in your motor oil and cleans ALL internal engine parts preventing rust and corrosion. CD-2 Oil Treatment offers increased viscosity and friction modifers for maximum engine protection. This treatment also stops oil burning and exhaust smoke.