Email: I think this medium is overlooked and under-appreciated. People who have just done business with you are more likely to engage with your email. Especially true for service customers.
Texting: this medium is being abused. Texting is still the fastest way to get engagement, but the spammers have figured this out too.
Equity: every dealer says this because you're dealing with people who have elected to be in market. We are looking at your entire database. And that's the key - most dealers do not have a good communication process for staying connected to people who have bought cars or done service at their store.
Glad you found a use!