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2007 Mercedes-Benz GL450 Questions

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I use premium gasoline all the time, there is no alert light , and the engine knocks mainly if I start slow going uphill.
there is 3 light in the front the smallest one on the left side won't turn off
In reading your site, I've seen multiple similar complaints about this type of transmission failure. Why hasn't MB done a recall?
I had opened my sunroof & now I can't get it opened. Water is dropping in but not much water.
I turn off engine, exit car, lock doors and wait for lights to go out. then i notice that the rear license plate light blinks intermittently all night long
MY GL450 NEEDS AN INTAKE MANIFOLD REPLACEMENT. IT IS COVERED UNDER 3RD PARTY EXTENDED WARRANTY. THE INSURER WANTS TO REPLACE THE FAULTY MANIFOLD WITH A USED PART FROM ANOTHER GL. ANY PROBLEM USING A USED MANIFOLD. CAN I INSIST THAT THEY REPLACE IT WITH A NEW MANIFOLD?
once this happens, the car decelerate and throttle does not respond
I have to jump my battery after every 2 days if I am not driving it.
either it rises or goes down in the front end on its own while driving
I fixed my cam shaft and another part that had to due to the manifold removal
No power steering on start up for about 15 seconds no change with engine rpm
When I press the level button, its says compressor is not available. what could this be???
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