I do the changes on my Fusion myself, but I have an agreement with the Nissan dealer for our Altima, so they do all the oil changes for us, and I know exactly what they are putting in... and it's not what is spec'd for the car.
The 2.5 engine in our '14 Altime is supposed to get syn 0w-20 but the dealership puts semi-syn 5w-30 in it. I found out on our 3rd oil change and had a long discussion with the service advisor there about it after I noticed on the paperwork, which ended up turning into a discussion with the service manager. I asked him how they think it's okay to use it when the manual clearly states 0w-20, and he ended up digging up a document issued by Nissan USA stating that in warmer climates, the 5w-30 was approved for use.
We talked further, and I expressed my concerns and they noted them in their system, but since they do all the maintenance, and the car is covered by a 7-year, 100,000-mile warranty, I'm leaving it up to them. Since it's all done in-house, there's no push-back.