2008 Mercedes C-Class Owner's Manual - Page 341

Operation Tires and wheels Important notes on tire inflation pressure Warning! If the tire inflation pressure drops repeatedly: Check the tires for punctures from foreign objects. G i Driving comfort may be reduced when the tire inflation pressure is adjusted to the value for speeds above 100 mph (160 km/h) as specified on the tire inflation pressure label (if available) located on the inside of the fuel filler flap. Make sure to readjust the tire inflation pressure for normal driving speeds. You should wait until the tires are cold before adjusting the tire inflation pressure. Some vehicles may have supplemental tire inflation pressure information for vehicle loads less than the maximum loaded vehicle condition ( page 348). If such information is provided, it can be found on the tire inflation pressure label located on the inside of the fuel filler flap ( page 322). Tire inflation pressure changes by approximately 1.5 psi (0.1 bar) per 18°F (10°C) of air temperature change. Keep this in mind when checking tire inflation pressure where the temperature is different from the outside temperature. 1 Tire and Loading Information placard with recommended cold tire inflation pressures The Tire and Loading Information placard lists the recommended cold tire inflation pressures for maximum loaded vehicle weight. The tire inflation pressures listed apply to the tires installed as original equipment. Check to see whether air is leaking from the valves or from around the rim. Tire temperature and tire inflation pressure are also increased while driving, depending on the driving speed and the tire load. If you will be driving your vehicle at high speeds of 100 mph (160 km/h) or higher, where it is legal and conditions allow, consult the tire inflation pressure label (if available) on the inside of the fuel filler flap on how to adjust the cold tire inflation pressure. If you do not adjust the tire inflation pressure, excessive heat can build up and result in sudden tire failure. 340