Vehicle care 155Summer and winter tyresIf you use winter tyres, the sparewheel may still be fitted with asummer tyre.If you use the spare wheel when it isfitted with a summer tyre the vehicle'sdriveability may be affected,especially on slippery road surfaces.Directional tyresFit directional tyres such that they rollin the direction of travel. The rollingdirection is indicated by a symbol(e.g. an arrow) on the sidewall.The following applies to tyres fittedopposing the rolling direction:■ Driveability may be affected. Havethe defective tyre renewed orrepaired as soon as possible.■ Do not drive faster than 50 mph.■ Drive particularly carefully on wetand snow-covered road surfaces.Jump startingDo not start with a quick charger.A vehicle with a discharged batterycan be started using jump leads andthe battery of another vehicle.9 WarningBe extremely careful when startingwith jump leads. Any deviationfrom the following instructions canlead to injuries or damage causedby battery explosion or damage tothe electrical systems of bothvehicles.9 WarningAvoid contact with eyes, skin,fabrics, and painted surfaces. Thefluid contains sulphuric acid whichcan cause injuries and damage inthe event of direct contact.CautionThe air suspension system mustbe switched off prior to jumpstarting.■ Never expose the battery to nakedflames or sparks.■ A discharged battery can alreadyfreeze at a temperature of 0 °C.Defrost the frozen battery beforeconnecting jump leads.■ Avoid contact with eyes, skin,fabrics and painted surfaces. Thefluid contains sulphuric acid whichcan cause injuries and damage inthe event of direct contact.■ Wear eye protection and protectiveclothing when handling a battery.■ Use a booster battery with thesame voltage (12 volts). Its capacity(Ah) must not be much less thanthat of the discharged battery.■ Use jump leads with insulatedterminals and a cross section of atleast 25 mm2.
