Okay so the car frame itself lasts 400-500k before being replaced? I'm assuming there are multiple stints of heavy powertrain maintenance during that lifetime.

Okay so the car frame itself lasts 400-500k before being replaced? I'm assuming there are multiple stints of heavy powertrain maintenance during that lifetime. Similarly, if your car's battery gets degraded after 200k miles (or whatever), you just get a new one, much like you might replace the transmission.