could it be the blowby from the EGR. I have/had a lot of black oil in the intake of my 85 TD. It dried up once I stopped the EGR leakage.
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85 Merc 300D - Unwinding 31 years of wear
86 VW TD
Mahindra Diesel
Iseki Diesel
In 2007 I didn't own a diesel.
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