First, here is one link to you might want to read
http://autopia-carport.com/Detailing-Articles/The%20Myth%20Of%20Saddle%20Soap.html
Here is what I can tell you from reading month's worth of posts on this subject.
1. Ron Ketchum(who sadly very rarely posts on this board anymore) has stated over and over that the Big 3 car manuf. and most imports all use CLEAR COATED leather in their autos. The clear is made to protect the leather surface. This clear coat is broken down by OIL based cleaners and conditioners. Ron mentioned that using a water based PDMS dressing (303, Vinylex etc) was the proper way to dress leather seats. Here is a post from an email sent to me
"Never apply "oils" as it slowly disolves the clear coating. That coating is
made, like so many from petrouleum and as with any coating of that type, the
oils try to return it to it's natural state.
Use a very mild cleaner and be sure and rewipe the cleaned area with a towel
that is wet with water and then dry it to remove any of the surfactants in the
cleaner that may be left behind.
Then apply 303, our Rubber Protector, etc,. Let it set, determine how much gloss
factor you desire, the longer you let it set the higher the gloss factor and
then wipe dry with a dry towel to set the resins and remove any excess.
Any "conditioning" is not really happening, that is "marketing" bullshit.
Kinda of like adding "oils" or "feeding" the paints clear coat.
Sure makes people buy product though."
Test the leather on an out of the way spot. Take some general purpose cleaner, spray it on a rag, wipe a VERY small spot the leather in an out of sight area. If color comes off on your rag, then you have non-clearcoated leather. If no color comes off, you have clear-coated leather.
If your leather is NOT clear-coated then an oil based conditioner(lexol, leatherique etc) is the way to go.
If you have clear coated leather then clean with a mild cleanser(lexol leather CLEANER, or mild soap and water). Make sure you rinse with a clean, damp cloth to remove the soap. Then dry with another clean towel, then apply your PDMS product.
Just to provide more data, the owner's manual in my 2002 Ford F-150 Supercrew states the following:
"Do NOT use oil based leather conditioner products on your F-150. The leather is clearcoated. To condition, use a quality vinyl conditioner. Wipe on the Vinyl conditioner, and let set, then wipe clean with a clean cloth."
I currently use Pinnacle Vinyl and Leather cleaner on my leather and Vinyl, and 303 to dress all Vinyl and leather. I have had the 303 on the seats for two months, and have no complaints. The leather is not overly slick or greasy, and has a nice matte shine.
My wife spilled a little water on the seats the other day, and the water beaded up like it had Klasse on it. Really nice. Wiped up the water. No marks left afterwards.
Before you use saddle soap or anything else, search this board on leather care and the like, you will find much info.
That all said, it is your choice, and to all other folks who use leather conditioners and saddle soap, if it works for you, stick with it.
Good luck
SJ