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@gbj_tester
Would be interesting to see whether fatigue was actually the limiting factor on any part of the A8 chassis - often with vehicle structures (bicycle and car), once you've thrown enough metal at the problem to solve the stiffness requirement, the strength and fatigue life look after themselves. After that, it would be interesting to see what fatigue life Audi decided was a match for their brand aspirations - few first owners are likely to go past 250,000 miles. The accountants will point out that it's cheaper to fix early failures than it is to make everything last a long time (even if those early failures kill people and you have to pay compensation, in some cases), but the marketing department might say that a reputation for long service life is a good advertisement which can generate new sales from people stepping up from old second hand models.