They are from the vacuum pump. That happened to another list member and friend of mine. I would think it happened before you owned the car as you surely would have noticed the effect that not having that baring would have on the vacuum pump
How long have you owned the car?

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"