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I'd think such "wear" would disappear in the noise of the varied conditions engines see under normal use i.e. city car will see 10x? 30x? 100x? the amount of start/stop cycles, and accels from a dead stop as an identical car model based in South Dakota yet both deliver acceptable lifetime intervals.
It seems to me that chassis' rust away and owners simply get tired of driving a car after, say, 250,000 miles, and it gets junked and yet... many of those cars have never had an engine teardown...
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