2010 Mercedes GL-Class Owner's Manual - Page 266

264 Driving instructions Checklist before off-road driving Engine oil level RCheck the engine oil level (Y page 230). Only with a proper oil level can the vehicle obtain a trouble-free oil supply, even on steep gradients. Driving in steep terrain ! If the engine oil level warning lamp comes on while driving, stop the vehicle in a safe location or as soon at is safe to do so. Check the engine oil level. The engine oil level warnings should not be ignored. Extended driving with the symbol displayed could result in serious engine damage that is not covered by the Mercedes-Benz Limited Warranty. Tires RCheck the tread depth and maintain specified tire inflation pressure. A placard with the recommended tire inflation pressures is located on the driver's door Bpillar (Y page 243). RCheck Operation Slope angle : Overhang angle, front ; Overhang angle, rear Vehicles with air suspension program Raised level Highway Vehicles with enhanced off-road package Off-road level 3 Off-road level 2 Off-road level 1 Highway : : GL 450, GL GL 350 550 BlueTEC 31° 26° 32° 27° ; all models 26° 21° ; all models tires for possible damage and remove foreign objects. missing valve caps. RReplace Rims RDented or bent rims can cause tire inflation pressure loss and damage the tire beads. For this reason, check and, if necessary, change rims before driving off-road. Vehicle tool kit RCheck if the jack (Y page 286) is functional. RAlways : : GL 450, GL GL 350 550 BlueTEC 32° 31° 28° 26° 33° 32° 28° 27° 27° 26° 23° 21° take the vehicle tool kit, a strong tow rope, a shovel and a small plank (to put under the jack on sandy soil) with you. RComply with the warnings (Y page 262) and rules for off-road driving (Y page 263). RDriving on embankments, slopes and other steep inclines should only be done straight up or downhill, i.e. in the line of gravity. Maximum vehicle climbing ability is a