Dear friends,

I'm not familiar with diesel cars. I would like to know the name
and purpose of the key-like button (with the label Adecco attached to it) as shown in the attached image of a 1981 Mercedes 240D.

Thank you very much for your precious help.

Best regards,


Eric

Attached Thumbnails

 

Eric:
That's the idle adjustment. Mostly useful for cold weather starting.

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1982 Mercedes-Benz 300CD
1982 Mercedes-Benz 240D - stick

It doesn't help for STARTING, it simply allows you to run at a fast idle while the engine is cold.

Have a great day,

it is to put your diesel in mach one so you can pass all those
porsche's and ferrari's haa haa