Good advice Skooba:dNo It does not! I bought a bottle to repair HG on my Neon, all parameter correct as per makers instructions, mixed with a good anti freeze, drained the engine and added. Engine has to idle to come up to temperature to work. After 10 mins engine stopped! Now as well as HG I need new conrod & piston. Mechanic working on the car now said the stuff had been drawn into the piston then could not be pushed out through the valves. Something had to give. Do Not use.