2009 Mercedes SLR McLaren Owner's Manual - Page 404

Technical terms Cruise control Driving convenience system for automatically maintaining the vehicle speed set by the driver. Curb weight ( page 286) DOT (Department of Transportation) ( page 287) Engine number The number set by the manufacturer and placed on the cylinder block to uniquely identify each engine produced. Engine oil viscosity Measure of the internal oil friction (viscosity) at different temperatures. The higher the temperature the oil can tolerate without thinning too much, or the lower the temperature it can tolerate without thickening too much, the better the viscosity characteristics of the oil. ESP® (Eectronic Stability Program) Improves vehicle handling and directional stability. ETD (Emergency Tensioning Device) Device which deploys in certain frontal and rear collisions exceeding the system's threshold to tighten the seat belts. ->SRS GAWR (Gross Axle Weight Rating) ( page 287) Gear range Number of gears which are available to the automatic transmission for shifting. The automatic gear shifting process can be adapted to specific operating conditions using the gear selector lever or the steering wheel gearshift control buttons. GPS (Global Positioning System) Satellite-based system for relaying geographic location information to and from vehicles equipped with special receivers. Employs CD digital maps for navigation. GVW (Gross Vehicle Weight) ( page 287) GVWR (Gross Vehicle Weight Rating) ( page 287) Head-thorax air bag Installed in the doors, these air bags protect occupants during side impact collisions exceeding a preset threshold. Unlike normal side air bags, head-thorax air bags are also designed to provide protection for the head area. 404