2003 Mercedes E-Class Owner's Manual - Page 371

Technical data Fuels, coolants, lubricants etc. If the coolant level is low, water and MB Anticorrosion/Antifreeze should be used to bring it up to the proper level (have cooling system checked for signs of leakage). The water in the cooling system must meet minimum requirements, which are usually satisfied by normal drinking water. If you are not sure about the water quality, consult your authorized Mercedes-Benz Center. Anticorrosion/antifreeze Your vehicle contains a number of aluminum parts. The use of aluminum components in motor vehicle engines necessitates that anticorrosion/antifreeze coolant used in such engines be specifically formulated to protect the aluminum parts. (Failure to use such anticorrosion/antifreeze coolant will result in a significantly shortened service life.) Therefore, the following product is strongly recommended for use in your vehicle: Mercedes-Benz 325.0 Anticorrosion/Antifreeze Agent. Before the start of the winter season (or once a year in hot southern regions), you should have the anticorrosion/antifreeze concentration checked. The coolant is also regularly checked each time you bring your vehicle to your authorized Mercedes-Benz Center for service. Anticorrosion/antifreeze quantity Model E 320 E 500 Approx. freeze protection - 35°F (- 37°C) 5.3 US qt (5.0 l) 6.0 US qt (5.65 l) - 49°F (- 45°C) 5.9 US qt (5.5 l) 6.6 US qt (6.2 l) 371