$6K is way too much for a MB-if you intent to convert to WVO. My wifes 1985 300D which has been running on WVO for a few years & was her daily driver, is up for sale at $3900(+/-). The wife has a hybrid now. Her 300D had a new paint job but looks and runs great.

However $3900 was the same price I sold my father in laws 1984 300D WVO converted. (We are talking a PROPER conversion-Flate Plate Heat exchanger, Tube in hose, Custom WVO tank 28 gallon, etc-not some one tank or junky conversion that will trash your engine) a while back.

Be patient for a good MB at a reasonable price and if going WVO spend the time/funds for a conversion that gets WVO up to proper temp (160F+)and + Filter, filter filter and dewater, dewater dewater your WVO.