Well, I know it's a Mercedes...
just depends on which the company gives him I guess. I saw a pair of S55 AMGs in his parking spaces today with a CLK55. I saw a new 07 S600 in his spots too. For a while it was always an S65 and CLS55 AMGs. A few times I've seen a Maybach and and SLs... pretty much everything Merc sells. E class diesel, new Mclass, C55 AMG, SLK55 AMG, Gwagens, etc.
I'm not even sure he drives... he might be chauffeured since I see a driver at the door a lot.