Oil's not well in the car
Before the 80's, most leathers used in cars were a nice top grain, reasonable quality product. They were not sealed with a protective coating and required a lot of work to look after them correctly. We have a few cars in our collection with this type of leather, but most notably a 1955 300SL Gullwing Benz and my personal favourite, the 1964 AC/Shelby competition Cobra. Both have the original trim from the factory and have a marvellous patina to them that only happens with leather that has aged well. In these vehicles is a non sealed, aniline type dyed leather, which requires old world skills and products to look after them.