I have a google search on "car care" that emails me every day the latest news. Usually there's about 1 a week caught in that net, that I send out on my facebook or instagram feed. It catches things like "winter prevention", tips for washing your car, safety on how to control a skid, etc. I also have googled car care hacks and found some things on pinterest, etc. that I use as content. For example, how to clean out the crevices on your dash vents, etc. There's a lot out there that will lead you to credible companies and sources to reuse.
I just do social media, not a newsletter. I don't 'think a paper newsletter would work, at least not for me.