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In my humble opinion, the main benefits of a BBB accreditation are not SEO authority, but:

• Using the accreditation seal in print and banners to generate trust,
• Add the company's BBB-page as a review extension in Google AdWords - one of the few extensions that is generally accepted by Google as a valid reference.

This will not help with SEO ranking, but will improve the conversion rate, clickrate in AdWords, and therefore AdWords Quality Score and PPC ranking.

So let's say I have a site called "ToyotaParts.com" that has good SEO metrics and is ranking highly for keywords like "toyota tires", "toyota battery", etc....

What if I decide that I wanna target other cars as well with my site and keywords like "mazda tires", yet still want to take advantage of my domain's existing authority...

Can I do something like get a new domain like "carparts.com" and redirect the old domain to it and then continue to create new pages that would target new keywords, or would I risk losing my current domain's authority or running into other seo issues?

Thanks a lot