The oil is suitable for hardship cases. A white Knoll Barcelona chair from the 80s, who stood in the sun long so I get to go back. The leather hardness goes back, the leather will be shaped again and the shrinkage by the heat goes back at least to some extent. In addition, each passage cleans the surface (At Knoll leather this is colored with a color layer) and the chair is always brighter. A good liter I worked for 6 months in a single chair. Every couple of weeks really tired rub and then let stand 6-10 days. Then the rest rub with a paper towel. Takes a long time, but the result is convincing.
