Mercedes-Benz SL-Class 2009 Owners Manual - Manual (Page 294)

Vehicle status messages in the multifunction display
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Do not overinflate tires. Overinflated tires can adversely affect handling and ride comfort, wear unevenly, increase stopping distance, and
result in sudden deflation (blowout) because they are more likely to become punctured or damaged by road debris, potholes etc.
Practical hints