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Hello to all. What is the practical use for the idle adjustment knob on the dash of a 240d? When I bought my vehicle a few years ago, I adjusted the idle to one level, and I have left the idle alone since then. Is there any benefit to adjusting the idle periodically? Thanks. Tim S.---1983 240d---155,000 miles
 

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Really, the only benefit to adjusting the idle up is after a cold start when the engine is knocking a bit (OK, maybe significantly more than "a bit"). This is usually in winter weather, or when a glow plug is going bad. Once the engine is warm and smooths out, it can be reset to the minimum idle. There is no real benefit beyond that.
 
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