who pays for first gm terrain oil change

Did you get the full service plan or did the dealer say oil changes on the house for a year or life ect otherwise you do unless its a lease then the dealer may have included it but may not have so either way look at your service agreement.

The window sticker said 2 free oil changes and tire rotation . Who pays for this service? The dealer or GM ? I paid cash for this Terrain.

I'd think the dealer because the only thing GM pays is rebates back not service's.