I ran 100% WVO in a two tank system on my old '78 300D. I intend to re-install it, with modifications, into my '83 240D. I made my own heat exchanger and electric fuel heater, and plumbed it myself for about $250. I had no problems with the WVO; to the contrary, it was biodiesel that was plugging filters every other week for me. I was able to heat the WVO to 140-160 F under most conditions in the spring and summer in Denver.
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