Typically I use available light or 3 flash units through umbrellas.
It is not the only way to do it, and you probably could get a way with using less equipment but it is going to be more than a single strobe. Or maybe you can find a location and a natural lighting situation that is good enough for what you want to do.
You see how you kinda said the same thing I did? I didn't assume he was trying to take a full on commercial quality picture of his car. OP had already mentioned that he only had one strobe, that led me to believe that he wasn't going to procure a truckload of equipment for this.
Anel ,
I just looked through
This thread on here and there is some pretty good photography of cars. There are a lot of uninteresting shots to be sure, but you will probably get some good ideas. In the first 10-15 pages there are some really good shots of BMW's.