i've been using the lexol, same as steve. works good & is not too shiny (like armorall).
I'm waiting on this product from Finish First. sounds good:
For use on your leather, vinyl and rubber we have LIQUI-TECH PROTECTANT with lanolin. This non-alcohol formula replenishes the oils and plasticizers restoring and maintaining the original luster and softness that are usually lost through heat and age. When applied, it penetrates quickly, then buffs-off leaving the surface clean, not oily or tacking. In addition, LIQUI-TECH?S PROTECTANT adds oil and water resistance and reduces ultra-violet damage from the sunlight which helps reduce cracking. When using on tires, spray a light coat on the tire, then walk away and let it penetrate into the tire for a couple of minutes. Then return, spray PROTECTANT on a towel and wipe the tire area. BEAUTIFUL!!!!
here's url:
http://www.finishfirstpolish.com/GoCart/enter.asp