It is true that there has to be a compelling reason for someone to sign-up. So promote the opt-in email list as a benefit. This means offering discounts and awards for service and purchases only available to subscribers.
The price is right. For the dealership the cost to send an email is very inexpensive. It is a cheap way to stay in front of customers and creating new email newsletters does NOT require technical experience. For the customer, the coupon or discount is a great way to save money.
If you are interested we use Constant Contact. Here is a link:
Sell more cars --
Dan