Our customers have found this equivalent to TCP. Formulated to prevent lead oxide build up on valves and still allow the lead to perform the anti-knock function prior to combustion. Prevents valve seat erosion from valve seat micro welding. Does not contain volatile solvent so it is safe in the cockpit. Has a graduated measuring and dispensing reservoir built into the bottle. Tested and stable down to 0°F. Decalin RunUp is not approved for use in the engines of certified aircraft. Use a 1/2" oz. per 10 gallons fuel.