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Agreed with doc data. A generic ad for a car is not going to help sell cars. But, an well written informative ad about the individual car will help! Autotrader.co.uk are a great example of how to do this kind of thing well. Generic car details are only a small part of the page. Think of ebay too, they would have hundreds, if not thousands of Dup content, but they encourage there sellers to use informative and descriptions text to help sell the products. This is a double edged sword, improve it for the users and the SEO will follow