I was in the automotive industry for a short period of time. During that time a detailer would come by the dealership. He was an older gent extremely knowledgeable. Could make anything old look new.
Only thing he ever recommended to use on real lether interiors was mink oil.
I have been using it for years on british and german sports cars. The leather loves it, soaks it in. You do need to buff it or it will feel sticky, but it lasts and nothing works better.