I've been using saddle soap on my dress shoes for decades with no adverse effects. I can't imagine the leather on your seats is as delicate as a pair of Ferragamo loafers, and the shoes look great. The saddle soap is supposed to restore oils and such, but I use it mainly for cleaning.
I don't think it's going to replace a good dressing, but for cleaning you can't get much better and the price is right!