Platinum 2004 CTS-V
I'm sure somebody has a higher outside temp than this, but who is it??
Leatherique is GREAT stuff. I ordered one of their kits a while back but still haven't gotten around to using it. If you take the seats out of the car and let the leatherique "bake" in the sun it literally pulls wrinkles out of the leather.I can't leave anything in my car that doesn't have a 200+ degree tolerance, or it will be melty after a day at work.
I treated my leather last weekend with this: http://www.leatherique.com/
I figured that the leather had to be drying up. Now it smells and looks like new. It wasn't bad at all to begin with, but it couldn't hurt.