How can I sell car via Internet?

First of all it all depends on were you live because I am pretty sure there are many local sites in your city/area that specialize in cars?

But if you think your car may raise international interest or you like a national coverage for your car you should go to a big site like e-bay motors that will publish your car, and have a really big coverage. You can use this site for help although the e-bay site is rather good and understandable.

http://www.ehow.com/how_4727_sell-used-car.html

Well there are a few online sites that advertise cars, it depends on the make and model of your car because you can find sites that specialize in selling your car. etc.. Porsche's. In my opinion the best sites are ebay (the motors area), the autotrader website-

E-Bay motors is good, but you will need some kind of credit card, and it will cost you a little.

The best way that I have found to sell a

Try websites that are dedicated to sports cars or general auto focused sites, post your ad and include links to it in the sports car forums.  Both of those car sites have communities to them.  Should be easy to sell your car there. Good luck selling your car!

Try to look for a related site where you can sell your car.  E-bay is a good marketing site.  Then try to make some promotion about your car.  And also try  Car Forums.