JWR,
Autozone.com (the auto parts franchise) has a free feature that allows you to create a profile (make up an alias and use good OPSEC), enter your vehicle(s) information and then access repair guides for various subjects. You can, of course, also purchase parts and have them shipped to your anonymous mail drop location.
They keep you updated on recalls, service reminders, etc. You can even download a free app for your iPhone, which includes access to the repair guides, which comes in very handy if you’re on the road and have a breakdown. Of course, post-TEOTWAWKI, the service probably won’t be available… but for now it’s great. – NIM