Looking to keep your Mercedes-Benz diesel engine in tip-top shape? This coolant flush kit comes with everything you need to do just that! OEM Citric Flush, 8.7ounce Bottle of Shout Ultra Gel, Thermostat with O-Ring, Thermostat Housing Gasket, Radiator Cap, and an Optional Coolant Bypass Hose are all included. Keep your engine running like a dream with this easy to use flush kit - it's the perfect way to stay on top of regular maintenance.