This is one of those questions that will bring enough opinions to really confuse. Some say mink oil products, some say no. Some say lanolin some say no and on and on.
Here is what I do and have been doing it for many years in my other life, Harleys.
I go to the Harley shop and not necessarily buy the Harley Products but get the leather care products there. Good selection and usually some very knowledgable people. Not to say the products at the Benz dealer are not good, I have even seen some of the same stuff there but when dealing with leather, got to "Rome".
Good luck