I've had this oil leak for as long as I've owned the car, and I was wondering where it is coming from. If I were to guess it might be coming from the headgasket, but there is no coolant in the oil, no oil in the coolant, and no other signs of headgasket failure.

Is there anywhere else this oil could have originated from?

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'84 190d 2.2 - Silver
Converted to 5-Speed
'84 190d 2.2 - Blue
Factory 5-Speed

'76 300D (W115)
Sold, found again in less auspicious circumstances