I buy the Mobil 1 and filter and my dealer uses my parts and charges me $13. I used to change it myself but the recycling effort alone is worth the $13 to me. I use my own parts because I can get them significantly cheaper than the dealer can.
Is 10-12K miles the recommended for synthetic? That seems like a lot of miles between changes - although I recognize that driving conditions contribute to the need for an earlier change.
I've been doing my own changes at home for 21 yrs on my Blazer - and probably will continue. However, I do like the idea of buying my own oil & filter and having a qualified shop do it for "cheap" labor. I may have to do that when I get the Acadia.
Dealership service center charges $60usd(+tax). Includes full synthetic oil change, tire rotation, and also include a wash and vacuum. local shop charges $80usd for just an oil change and both times I've tried out the local shop, I end up with oil on my garage floor. I take it in for oil changes at around 6/6500miles instead of the recommended 7500miles to hopefully keep the timing chain in good condition.