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Bligoo, So my understanding is that you're interested in creating a used car site, however the debate is whether to use auto in the URL or have something completely else, and have other URL's that do have Auto pointing to your website. Well my first instinct is that it's harder to link build and SEO/create multiple websites than one.  Plus you just can't create a website and 301 in it, you're going to have to link build for it especially if the SERPs have tons of "auto" related results.  Also if you just use these websites as, spammy websites to redirect to your Auto website Google might catch on and blacklist both them and your primary website. I would go with something in the Auto name, especially if you're going to be a completely online company. However, before you do anything you need to ask yourself: Is Auto in the name really worth it?  Why don't you just create good content, that people can find and use? Why the keyword auto?  Why not something longtail such as "Auto Reseller" or  "Auto buyer", that might prove to be more beneficial.  What other words do people use when buying used automobiles? 3) Are you going to be a local business as well?  If so you might want to make something more user friendly? Do you guys already have a local business in place?  If so why don't you use it and it's word of mouth? As always, I hope this answers your question.

Thanks! I would like to 301 to this page http://bligoo.com/explore let me know what you think