110 Vehicle careIncorrect tyre pressures will impairsafety, vehicle handling, comfort andfuel economy and will increase tyrewear.9 WarningIf the pressure is too low, this canresult in considerable tyre warm-up and internal damage, leading totread separation and even to tyreblow-out at high speeds.Tread depthCheck tread depth at regularintervals.Tyres should be replaced for safetyreasons at a tread depth of 2-3 mm (4mm for winter tyres).The legally permissible minimumtread depth (1.6 mm) has beenreached when the tread has worndown as far as one of the tread wearindicators (TWI). Their position isindicated by markings on thesidewall.If there is more wear at the front thanthe rear, swap round front wheels andrear wheels. Ensure that the directionof rotation of the wheels is the sameas before.Tyres age, even if they are not used.We recommend tyre replacementevery 6 years.Changing tyre and wheel sizeIf tyres of a different size than thosefitted at the factory are used, it may benecessary to reprogramme thespeedometer and make other vehiclemodifications.9 WarningUse of unsuitable tyres or wheelsmay lead to accidents and willinvalidate the vehicle typeapproval.Wheel coversWheel covers and tyres that arefactory approved for the respectivevehicle and comply with all of therelevant wheel and tyre combinationrequirements must be used.If the wheel covers and tyres used arenot factory approved, the tyres mustnot have a rim protection ridgeWheel covers must not impair brakecooling.
