2006 Mercedes R-Class Owner's Manual - Page 528
2006 Mercedes R-Class Manual
Page 528 highlights
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.) 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 Light Truck Center for service. Anticorrosion/antifreeze quantity Model R 350 R 500 Approx. freeze protection - 35°F (- 37°C) 5.0 US qt (4.75 l) 5.6 US qt (5.25 l) - 49°F (- 45°C) 5.5 US qt (5.2 l) 6.1 US qt (5.8 l) 527