My sig truck's leather seats are, except for the driver's seat, like new. Sweat, dirt, grime, grease, etc, have "yellowed" it some, but it doesn't look too bad. The seats get a rare wipe-down with Meguiars leather wipes. When our SC Baptist Disaster Relief Team (basically a chainsaw unit) went to Kinston, NC, after Hurricane Irene (?) went through, we got caught out in pouring down rain and got soaked a couple of times before we could get back in the truck. When we got out, there was a mud hole full of water in each seat. We would dry it up as best we could, and I wiped it down again with Meguiars when I got back home, and they don't look like it did them any damage. I do have a carport and I use a windshield sun shield in hot weather--(I ain't real fond of getting in a super-heated truck)--which I am sure helped save the leather.