While I know nothing about how the Model S leather is manufactured and treated, most of the leather used in car seats has been extensively doctored and treated. While creases and wrinkles are common and natural in all hides, the manufacturers use coatings of various kinds to create an artificially "perfect" surface. In many cases the coatings create textures and other surface treatments that look good but adversely affect the longevity of the leather.
I've had a side web business for over then years developing and selling accessories for the Honda S2000. Many are leather products. They're all made by Townsend Leather, a maker of premium leather hides, seats, and other items. They do custom work for show cars, make leather seats for private aircraft, and other high quality work. I've visited their factory in upstate New York and learned more than I need to know about leather care. On the other hand, I have learned how leather should be maintained.
First off, many of the leather care products marketed commercially, and it's a very long list, do the leather more harm than good. As an earlier post noted, for normal care the best treatment is a wipe-down with a damp cloth. Forget saddle soap, Lexol, and most of the other well-known leather "care" products made by the big name companies. Under normal use leather car seats will not need any special cleaning or treatment more than once a year. Townsend makes a leather care kit for this purpose, which is available here:
Rick's Custom Leather
Scroll down to the bottom of that page and you'll see some useful information about leather care, a detailed description of what's in the kit, and click-through to order the kit.
I've used the kit on the leather seats, steering wheel cover, and other items in my Honda S2000 and they all look like new after 11 years.
