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@ all: Paragraph 16 in the PDF document referred to by Mike says Porsche has paid IMS single row warranty or goodwill claims on 4% to 8% of single row bearing cars in the US. As such, one can consider this lower bound numbers because they do not include failures rejected by Porsche, repaired by non-Porsche shops, or cars simply written off.
@Ankur - what basis do you have to suggest that failures decrease with mileage. It can't possibly be that the bearing becomes stronger with age. More likely, this phenomena simply reflects the fact that IMS seals degrade more when cars spend a lot of time parked thus leading to lubrication issues sooner and subsequent failures at lower miles
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