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If one believes that rubber deteriorates with time and exposure to UV and oxidizers, then it becomes a question of how far is one willing to let tires deteriorate before replacement. 3 years, 6 years, 10 years, 15 years, is just a matter of risk-reward calculation. I personally would follow the 6 year recommendation for more rigorous inspections of the tires and aim to replace the tires within a year or two (waiting for a good deal, for example).
On the other hand, if one believes rubber does not deteriorate with time, I wish them the best with their BMW coolant hoses.
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