The coolant had a leak, which was fixed, right before the entire headgasket blew at 117,000 miles. We took it into the dealer and they said that "Cars are only made to last until 100,000 miles". They also admitted that it was a casting defect that the manufacturer knew about. They told me it was worth about 200 dollars and a piece of junk. Replacing it would be pointless at this point. Interesting, a car should only last 100,000 miles. He said he bought his girls each a saturn, but since he was on the outside looking in he knew to purchase a twin cam. I was not pleased with the service they gave me, nor the respect the dealership gave a woman.
Cars are built to last only as long as the warranty. If the warranty is 100k, then it is only built to last 100k. Whatever you get beyond that is due to the care of your car. I've seen BMW's hit 100k, and 400k, both the same model and year, both cared for differently.