I had the green stuff (Prestone) in my ol 450 sl 1977 for 5 years with no leaks same 5yr old green. No problems, just renewed with Prestone and again no problems! Still original radiator and water pump and heater core! I think that the propaganda on mercedes part to switch to their recommended product is over rated! I'll stick to green (with additives as needed). Just my opinion, Abe G