Believe it or not, regular Olive Oil works good and is a lot cheaper. It is what I used on my 04 KR, I just traded for a 12 KR and the seats are a lot different.
I've been using Smartleather on all of my leather seats. I tried Lexol, but it didn't seem to work as well. The Smartleather brought back the shine to my mystichrome seats. They were in need of some love when I bought the car.
I just bought leather interior protection from my Ford dealer last week for my Lariot. After getting home and reading the directions, it says do NOT use on King Ranch black interiors??
I tried it on my black Lariot interior and it seemed alright............Hopefully