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Hi there As long as your internal link structure is natural and your information architecture is natural, I wouldn't be too concerned. From the sound of things, all of these links fall into relevant categories for their respective brands and models. One thing I would be on the look out though, depending on how your URL structure is set up, are potential duplicate content issues. I would run through that resource with your web development team and try to tackle any of those you see, if they exist. Google can pass equity through PDFs, but I would be careful, because at the end of the day, just make sure your user experience is the best it could possibly be for your audience. If you want to learn more about optimizing PDFs, check out this resource from Search Engine Journal. Lastly, I would run a comb through your on-site SEO - your title tags could use some work and you could also optimize your eCommerce experience as well. InFlow has a lot of great resources for this sort of thing if you want some reading and ideas. Hope this helps! Good luck!