Hi Folks, First post, so apologies for any transgressions! I have a 2008 Aurion Touring (NZ), and was also interested in the leather - where it was used and what treatments. Local Toyota could not recommend any treatment - surprised me as they are also the Lexus agents! From inspection I would suggest that on the Touring model the leather is used on all the "touch" or "contact" surfaces, i.e. the surface you sit on and that you back goes against PLUS the area on the door panel on the arm rest and inside the arm rest handle. The sides and backs of the seats, etc. all appear to by vinyl. Fairly typical, from my experience, even with some higher end cars. No guarantees implied, but having owned some 10 to 15 cars with leather trim over the years, I have found that a product called Effax Leather Balm does a real good job of keeping the leather looking and feeling good. Used it in a RR Silver Shadow I had as a chauffeured car with brides in white dresses with no problems!! A 500 ml pot cost me $NZ35 from the local saddlery (horsey people's shop!). As always, try it on a small area first. Hope that helps