Run-flat tires

The symbol identifying run-flat tires is a circle with the letters RSC on the sidewall.
Run-flat tires comprise a conditionally self-supporting tire and a special rim. The reinforcement in the sidewalls ensures that the tire can continue to be used subject to certain restrictions, even if depressurized.
For information on continuing to drive with a flat tire, refer to Indication of a flat tire on page 85.
See also:
Tire inflation pressures X5 xDrive50i with three rows of seats
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Fuel specifications
Never use fuels labeled at the fuel pump as metal-containing.
Do not use leaded gasoline or gasoline with
metal-containing additives such as manganese or iron; doing so can cause permanent
damag ...
For US customers
The following only applies to vehicles owned and operated in the US.
If you believe that your vehicle has a defect which could cause a crash or could
cause injury or death, you should immediately i ...
