I think with the Lifetime there is a pro-rated refund up to the first 7 years, not sure how much it is (maybe its similar to how the 7 year plans are refunded?)
After 7 years there is no form of refund. Im guessing its not much anyway but have never inquired.
I keep my vehicles so long, the lifetime was the only one I would buy. Either none at all, or lifetime. I went with lifetime because like a lot of people have said...the stuff in these trucks cost so much to fix. Its still a gamble, of course, but 9 or 10 years from now when I still have the truck and something goes wrong.....