Mercury Quicksilver Quickare Fuel Treatment Mercury Quicksilver Quickare is a fuel treatment for all grades of gas and ethanol blends. This OEM-recommended fuel treatment will maximize your engines performance and stabilize your fuel. It is recommended that you use Quickare at every fill up. Benefits Maximize engine performance with all grades of gasoline. Help control corrosion, gum, and varnish build-up and phase separation associated with ethanol-based fuel. Help control moisture and corrosio