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About 7 yrs ago I spoke with a rep from the chassis manufacturer(Hydro Raufoss) at the SAE show. He suggested the tub should last less than 100k miles. Seems they're lasting MUCH longer. The Brits have been driving/tracking the heck out of their cars for many years without any major complaints of chassis failure. There are plenty of cars with 100k+ miles on them that seem to be in good shape. You might post this question on seloc.org. Seems the only chassis durability issue I've seen is the corrosion issue.