Try Meguiar's Detailer Line (professional) Leather Cleaner & Conditioner. I've been using it for years on automotive leather as well as leather furniture and even shoes. It's easy to apply as well as inexpensive (about $29) - meaning you will use it more often and your leather will look better.
Neatsfoot oil, same that I use on my King Ranch saddles. They have a non darkening formula if you don't want the leather to darken. I do. The darkening also lasts longer between applications as well, probable is why it darkens the leather over time.
Lexol would be another option, but a little higher then just Neatsfoot. I would check your local saddleshop, farmer's Co-Op, or TSC and see what they have.
I use Neatsfoot oil about once a year and Lexol every couple of months. Use both bottles of Lexol... cleaner and conditioner. The other products like Turtle Wax, etc work great on the leathers with a protective coating but are not meant for saddle leather.
I've been using the Meguiars also, but I read recently the KR leather is finished with a silicone product and it was important to use cleaner made for this. I haven't checked it out yet but am gonna do some checking after my Meguiars runs out.
thanks guys for all y'alls prompt responses. i'm definitely leaning towards lexol now. i read their descriptions and it sounds good. also, it dont seem too expensive for regular maintenance. now here's my next question. btw, i found a local pep boys store in Houston tat carries the products. thanks again fellas!
When I cleaned and conditioned King Ranch seats, I tried two different cleaners. On half I used Lexol cleaner and on the rest I used Tearless Baby Shampoo (which KR Saddle Co recommended because it is a very mild cleanser). Both turned out about the same and I used KR Conditioner on it all.