Silverhook Oil Tonic is formulated from an advanced blend of friction reducers, oil detergents and oil performance boosters, designed to enhance the lubrication, protection and cleaning properties of your existing oil. Oil Tonic has been developed to maintain engine cleanliness and effective oil circulation by preventing harmful deposits and corrosion build-up. Compatible with synthetic and mineral oils and safe for use with catalytic converters, turbos and soot converters.