Sixto,no we don't drain our waist in our sewers as you don't in your City by the Bay. You assumed I did and you know what assume makes you. IKCHRIS, per document MBNA/MBC 473 (Rev 3-87),FACTORY APPROVED SERVICE PRODUCTS, All Passenger Cars, Section H. APPROVED ANTICORROSION/ANTIFREEZE FOR ALL ENGINE TYPES. MB Anticorrosion/Antifreeze(specifically formulated to protect aluminum parts). Source MB dealers. You are right to the letter. My 1987 300E with 169,000 miles(rounded down, member SIXTO), had the original water pump renewed at 90,000 miles(same note) and the radiator and heater core are still in place. At the first change and every year after I have used Zerex.I have used the same technique. I encourage every member to evaluate and make his own choice. Happy Trails Beep Beep from clean sewers Houston.

Donald
Chief Sewer Inspector