pj67coll

That is the item. On US spec cars the 300D's had this knob on the dash until the turbo's were applied. After that they don't seem to have the knob. My '83 (with Turbo) does not have the knob, but even in cold weather it does not seem to need it.

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1961 190Db retired
1968 220D/8 325,000
1983 300D 164,150