I had a 2014 3.5 Eco F150 until 12/17. Even though I prefer to do my own oil changes I found that it would cost $50.00 for the dealer to change the oil and filter with the upgrade to full synthetic and this included tire rotation. Buying oil and filter myself cost that much. Granted before leaving the dealer I would check under the truck, the filter and oil level before paying. The last oil change on that truck found some oil dripping from the diaper on that engine and they took it back in to clean and didn't charge for the service.
I continue to get dealer oil changes on my new Ram 2500 6.4 Hemi as the 0-40 Pennzoil Platinum Plus Synthetic usually has to be bought online and 7 quarts plus filter runs about $80.00. The dealer charges this amount and includes tire rotation also. It is more cost effective this way and even though I have a floor jack and impact, wrestling those heavy tires at my age is a pain.
Needless to say I follow the same regime of inspection before leaving the dealer.
If you should want to run full synthetic changing from syn blend is not an issue.
Doug