From What I have read... A successful install of a one-tank-system involves a smaller tank 2-3 gallons to start and stop on diesel. I can't advocate starting and stopping on oil because of the obvious coking issues. As far as heating the oil... I run engine coolant lines to the tank and I also have my fuel filter wrapped with coolant lines...it keeps the temp right around 160 degrees...and my car has been running great... the last 4000 miles have been on WVO less the startup and shutdown intervals. I drive 100 miles everyday...so the savings has been really nice.

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1984 300SD, 283,000 miles and still runs beautifully.
My father had a 1980 300D. He had a love afair with these cars and has passed it on to me!