I went back to the gas station and discovered I had actually filled 16 gallons of gas in the 300D. I sure felt like an idiot. I drained all 20+ gallons, changed the main and pre fuel filters. Blew out the line w/ compressed air and loaded up 5 gallons of diesel before I drove it to the diesel pump.

After draining and refilling I now know my fuel tank capacity and determined i was running with 80% gas and 20% diesel. It was real hard to start the car the three times I parked it but incredibly it did run. I actually drove it 20 miles this way. I sure hope I didn't damage anything.

Full power, easy starting and relatively quiet idling have returned. My main concern now is that it doesn't start burning motor oil. I wonder if the cylinder walls got scored by gasoline washing them clean instead of being lubed by the diesel. The oil level did not change after the 20 miles so maybe the gas didn't do too much harm to my 200k mile engine.

This has been a very humbling experience.

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1972 450SL
1982 300D Turbo