2006 Mercedes SL-Class Owner's Manual - Page 317

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. Warning! G Warning! G Winter tires with a tread depth of less than 1/ in (4 mm) must be replaced. They are no 6 longer suitable for winter operation. Always observe the speed rating of the winter tires installed on your vehicle. If the maximum speed for which your tires are rated is below the speed rating of your vehicle, you must place a notice to this effect where it will be seen by the driver. Such notices are available at your tire dealer or any authorized Mercedes-Benz Center. If you use your spare tire when winter tires are fitted on the other wheels, be aware that the difference in tire characteristics may very well impair turning stability and that overall driving stability may be reduced. Adapt your driving style accordingly. Have the spare tire replaced with a winter tire at the nearest authorized Mercedes-Benz Center. i Block heater not available for SL 55 AMG and SL 65 AMG. 316