2003 Mercedes SLK-Class Owner's Manual - Page 274

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 Anticorrosion/antifreeze quantity Model SLK 230 Kompressor SLK 320 SLK 32 AMG Approx. freeze protection -35°F (-37°C) 4.9 US qt (4.7 l) 5.9 US qt (5.6 l) 7.7 US qt (7.3 l) -49°F (-45°C) 5.4 US qt (5.1 l) 6.5 US qt (6.1 l) 8.5 US qt (8.0 l) 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. 274