Silverhook Oil Tonic 325ml (Pack of 2 - Total 650ml) is a premium engine treatment additive designed to enhance lubrication and protection for modern petrol and diesel engines. It contains friction reducers, oil detergents, and oil performance boosters that improve oil circulation and prevent harmful deposits and corrosion build-up. This formula is compatible with synthetic and mineral oils and is safe for use with catalytic converters, turbos, and soot converters. It is formulated from an advanced blend of Molybdenum Disulphide friction reducers, oil detergents, and oil performance boosters.