All of the leather is coated with polyurethane. Just clean and treat it like vinyl. It will not absorb leather treatments or oils. If it has cracks those are cracks in the polyurethane coating that filled with dirt. Try cleaning them with a soft toothbrush and some mild soap with warm water.
Read this sticky thread from a Lexus forum as it applies to Toyota All about Lexus leather - ClubLexus - Lexus Forum Discussion