Some good information here. High resolution - i.e., large/fine jpg gives excellent results. By still life mode, you probably mean "macro" - also a good choice. A tripod is your best option for steady, low shutter speed images. Small tabletop units are quite affordable. Gitzo and Manfrotto make my favorite tripods. You can use flash if you diffuse the light with a thin white cloth (e.g., handkerchief). Don't be afraid to experiment.
For more info on car photography, see my series at:
http://www.motorsportsmarketingresources.com/short-stories/dom-miliano/taking-pictures-of-cars-dom-miliano.html