PSI (pounds per square inch)

A standard unit of measure for tire pressure.

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    Exterior & Styling
    Particularly from the rear, the GL's appearance looks a bit like Mercedes' original M-Class — so much so that a passenger walked up to an older M thinking it was the GL. The GL550's 21-inch wheels ...

    Kickdown
    Use kickdown for maximum acceleration. Vehicles for USA except AMG vehicles: fully depress the accelerator pedal. The transmission shifts to a lower gear depending on the engine speed. Vehicl ...

    Important safety notes
    WARNING Do not adjust the steering wheel while driving. Adjusting the steering wheel while driving, or driving without the steering wheel adjustment feature locked could cause the driver to los ...