Do you get oil changes there?

No

Yes they do. My mother bought there and they seem to offer many more services/repairs. My personal vehicle was not purchased there, but they did replace my water pump. Call ahead, make appointment. But it did take them longer than they told me to complete work.

Yes

only on cars u buy from them

Yes, on vehicles you purchased.

Possibly. I know they sent us to Yates Buick last time we inquired about an oil change.