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 [1]. 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