These belts will have a variable life span. What would be fascinating to understand is the bell curve of failure v mileage.
If: “The manufacturing maximum Replacement mileage is 54,000 miles. There is no lower limit mileage advised.”
Then what is the percentage failure before that mileage that Volvo believe to be acceptable?
And at what lower figure would failure mean that the part was: “Not for for purpose” when it was sold
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