[YoSteve]

modern auto leather is "finished", it's the reason why you take a white terry cloth spit on it and rub it on your seat, it doesn't come off on your towel. Try the spit test on a leather coat or bag and the brown or black comes right off.

At this point it makes sense to use traditional leather conditioners on unfinished leathers. On the finished kind, I still think the word is up.

Clean the leather with a good leather cleaner and use a conditioner twice a year and maybe 303 or something similar inbetween.

Someone can post the link that explains the leather deal better, but I still think it leaves the solution up in the air.