In a pinch I use the Lexol products, but actually the best I've found (and I need to order more) is by Zaino Bros - "Z-10 Leather in a Bottle". It conditions and leaves your seats smelling like fresh leather the longest (it also hides and small cracks, etc). I know a lot of classic car enthusiasts and they all use Zaino Bros products (for interior and exterior).

Website: http://www.zainostore.com/

Leather Conditioner:
http://www.zainostore.com/Merchant2/...oduct_Count=15

-- John