Under the Hood

The CLS500 gets a 302-hp, 5.0-liter V-8 that works with a seven-speed-automatic transmission. The CLS55 AMG has a 469-hp, supercharged 5.5-liter V-8 that's connected to a five-speed-automatic transmission. Both transmissions have manual-shift provisions.

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    Ride, Handling
    With an air suspension that can be adjusted to varying levels, the S550 rides with soothing composure. The BMW 7 Series is firmer, and the Jaguar XJ is downright stiff in comparison. It's even mor ...

    Resetting
    Reset the sliding sunroof if it does not move smoothly. - Turn the SmartKey to position 1 or 2 in the ignition lock. - Raise the sliding sunroof fully at the rear. - Keep the switch pressed ...

    Fuel requirements
    Gasoline engines Use only premium-grade unleaded gasoline. The octane number should be at least 91. Details can be found on the gas pump. The octane number is the average value of the Researc ...