Your going to kill your motor. Just run it on diesel, thats what it was designed for. I have seen to many old MB diesels ruined by people using WVO. In fact last month my buddy and I were trying to get a 1980 300TD with 200K running, the PO had run it on WVO and had ruined the motor. The compression was about 150-200PSI in all 5 cylinders, motor was toast..

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1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1973 450SEL 119,200 miles

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles