I wouldn't say there is a high tolerance for faults especially within the first few years. The auto magazines here put cars thru 100k and then tear them apart, looking for faults and unusual wear.
It's a combination of factors :
1. There are fewer short trips here. It's called public transit, walking, or the bicycle.
2. The climate is less extreme than Canada, and road salt is extremely sparingly used.
3. The fuel quality is higher.
4. The road infrastructure is on the whole, better maintained.
5. Parts are cheaper, easier to stock and procure, and technicians are locally trained. On the flip side, Japanese and Korean car parts are expensive.