Hi Frenchy Pilou,

I asked Michael how to try to export to blender3d 2.62 and i experimented last night a little.What I suggest you is to use blender3d 2.62 from blender main homepage.I tried experimental versions from graphicall.org but I had some problems with compatibility.You can export your objects as ngons.On my screenshots you can see what you could try to do and experiment with it until you find settings which removes problems with normals.When you import it in blender live it as ngons check every box and press on split tab if it doesn't.Then observe your model and watch if there are some problems with normals.If you are not familiar with cycles render,you could check on blendercookie.com how to use it.Here is the link from this website about how to render a car with cycles.
http://cgcookie.com/blender/2012/04/06/rendering-a-sports-car-in-blender-cycles-part-01/

Hope this helps you and to everyone who wants to render their models in blender3d.Enjoy and happy rendering.