I use the Mitchell system to organize my service reminders: State inspections, recommended services and major services. I had the Mitchell Company doing it, but found that their CRM was overkill. I now have a company through CARQUEST Auto Parts called Auto Alert, manage my service reminders. I have more control and it costs less. I go back 14 months.
I also purchase a mailing each year list for a radius of 5 miles from my shop. For these people I send a quarterly newsletter. This helps prospects for new customers. The newsletter also goes to my regular customers.
Another thing I do is email blasts. I collect emails from my customers and all the local businesses in my area. Once a month I send an email newsletter which highlights seasonal tips, promotions and has links to my web site.
For the emails I use a company called Constant Contact. Check it out, you can create your own professional looking email and it's very inexpensive. The link is below:
http://www.constantcontact.com