What about the vacuum pump? If the diaphragm is cracked it could be leaking oil, which is dumped into the intake, or is the 115, 240 different? Hows your vacuum?

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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"