Even at 500,000 miles (insanely high, even for a Toyota), it's still only about 2 years equivalent operating time. Trust me when I tell you that we had very severe services in the oil refinery where bearings, seals, belts, sheaves, and other things went much longer than that with no problem. My point is this: You said there is no such thing as lifetime on anything. But it is absolutely possible, and credible, to have some components last the lifetime of the car with zero maintenance. So when they tell me that a bearing or fluid doesn't need changed, I believe them. The operating time is low, and the severity of service is nothing compared to that in an oil refinery.
