What a mess! It was very small but went for a while before I noticed it. Dark shoes and dark floor mats and poor situational awareness skills led to a greasy, black mess! I'm sure many of you know this first-hand. The oil dripped ever so slowly and soaked the dash-panel insulation and dripped out the corners so it was hard to notice.
I got it pretty well cleaned up and the fitting tightened and am driving around with a white t-shirt on the floor until I'm sure the problem is solved.
Now I need some parts since I don't think the floor mats will clean up.
Kindly check my WTB in the "Parts" section.
Thanks.

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1983 M-B 240D-Gone too.
1976 M-B 300D-Departed.

"Good" is the worst enemy of "Great".

If it soaked into the floor mats, look carefully at the strip of carpet to the left- if you dont get it out of that, it will soak back into the replacement floor carpet. BTDT. I scrubbed, soaked, kitty littered, industrial dry sweep compound'ed the floor- and oil still came out of god knows where. Finally put down some thick black plastic and then put the floor carpet in.

Good luck- and double check the fitting- as it might be the oil gauge itself.

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95 E300D working out the kinks
77 300D, 227k, station car
83 300CD 370k, gone away
89 190E 2.6- 335k, no more
79 VW FI Bus- 145k miles, summer driver
59 VW Beetle ragtop- 175k miles
12 VW Jetta- 160k miles

Keep an eye on it, I recently had a similar situation, and it was leaking from somewhere inside the pressure gauge. I had to replace the gauge to fix it.

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My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much)

Wife's - '08 Saab Sportcombi Aero

Riding a '03 Yamaha Warrior