IF you get the car, may I SUGGEST a few things to do after you get it?

1. Oil and filter change
2. Transmission fluid change
3. Power steering fluid and filter change
4. Coolant flush (refill with correct M/B fluid)
5. Brake fluid change and pad inspection
6. New air filter and both fuel filters
7. Check/Replace the voltage regulator
8. Alignment check
9. Check rear differential gear oil level
10 Enjoy the car!!

Not going to wade too far into the WVO thing as some on here embrace it and others demonize it. If done CORRECTLY and with CARE it is a viable alternative fuel use. There is a separate alternative fuels sub-forum you can ask all the questions you need to and will usually get a straight and un-biased answer.

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2012 Mercedes ML350 Bluetec 91K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 231K (mine)
1998 Volvo S70 T5 Turbo 196K (kids)
1994 Ford F150 4WD 249K (firewood hauler)
1983 Mercedes 300D 376K (diesel commuter)