2005 Mercedes C-Class Owner's Manual - Page 293

Operation Winter driving Block heater (Canada only) The engine is equipped with a block heater. The electrical cable may be installed at an authorized Mercedes-Benz Center. Snow chains Snow chains should only be driven on snow-covered roads at speeds not to exceed 30 mph (50 km/h). Remove chains as soon as possible when driving on roads without snow. Only use snow chains that are approved by Mercedes-Benz. Your authorized Mercedes-Benz Center will be glad to advise you on this subject. Use of snow chains may be prohibited depending on location. Always check local and state laws before installing snow chains. i When driving with snow chains, you may wish to deactivate the ESP ( page 79) before setting the vehicle in motion. This will improve the vehicle's traction. Please observe the following guidelines when using snow chains: Use of snow chains is not permissible with all wheel/tire combinations. Snow chains should only be used on the rear wheels. Follow the manufacturer's mounting instructions. ! Even on vehicles with all-wheel-drive use snow chains on rear tires only. Use of snow chains is not permissible with tire sizes: 245/40 R17 91W 225/40 ZR18 92Y XL 245/35 ZR18 92Y XL T 125/90 R16 98M T 125/80 R17 99M 145/70- 17 92P 291