Hunter did an announcement warning about bad diesel out there. Cetene booster is the answer. You can also add 2-stroke ouboard motor oil to your fuel which will act as an upper cylinder lubricant, also boosting the mileage by approximately 10%. You might wanna add some injector cleaner to that tankful while you're at it, even though you did it on the last tankful . . . til you burn up the bad crap you got stuck with!!!! BTW, the cetene booster is in the "gray" bottle at the auto parts stores.

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1983 300D, the "Avocado"
1976 240D, 4-spd the "Pumpkin", SOLD to Pierre
1984 190D, 2.2L, 5-spd, my intro to MBZ diesels, crashed into in 2002