2007 Mercedes CLK-Class Owner's Manual - Page 479

Technical data Fuels, coolants, lubricants, etc. 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.) Anticorrosion/antifreeze quantity Model CLK 350 CLK 550 CLK 63 AMG Approx. freeze protection -35°F (-37°C) 3.9 US qt (3.7 l) 4.9 US qt (4.6 l) 5.8 US qt (5.5 l) -49°F (-45°C) 4.3 US qt (4.1 l) 5.3 US qt (5.1 l) 6.3 US qt (6.0 l) 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 an authorized Mercedes-Benz Center for service. 478