I have seen the oil tanks at my dealer and they aren't gigantic plus they are stored in the shop so I wouldn't worry all that much about condensation myself.
Just went on autozone.com and had a serious sticker shock. For mobile 1 it would be really close to $100 to do my own oil change.
Even the Motorcraft stuff would be over $50.
Even though I only get 2 oil changes a year I would still rather save the money.
Listen the tanks get moisture. Some dealers also cheap out and dont get motorcraft. I have been at a dealer for a long time. The moisture will probably never hurt anything. Id feel safer with seales bottles.