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have a 300d "gray" car (manufactured and sold in germany) what doe the knob on the dash do that is on the left off steering column and right of headlight controls? thanks
 

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It is an idle control, not mix. Basically a cable attaches to the throttle assembly and when you play with the knob, you can feel the gas pedal move one way or another. This is so you can turn the idle up on a cold start in the winters.
 
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