I have a 1983 Mercedes 240d with a dual-tank vmo kit already installed. The second tank is a 13 gallon aluminum tank that sits in the spare wheel well.
The system has a heated copper coil that wraps around the fuel filter plus a block heater. There's a manual switch on the console to switch it back and forth from WVO to diesel.
I just fixed the AC (blows cold), new battery (900 cca), new alternator, brand new tires. Just changed the WVO filter.
It runs well. Starts right up. No smoke.
Odometer is stuck at 266k; has many more miles than that. But it is one reliable car.
Also has new stereo system and a XM satellite radio system.
Asking $3,750. I'm in the Cincinnati, OH, area. Email me at firstname.lastname@example.org and I'll send pics and a phone number.