It would seem to me based on the conditions that cause the failure that cars that had the failure once would obviously be prone to future failures.. Also, one would think that if you've got an engine where the tolerances are iffy, you're going to have the problem sooner rather than later. If you're considering a used Boxster with more than, say, 35k on the clock and it's warranty history doesn't show an RMS repair you'd think you would not be prone to RMS failure.
*disclaimer - I am not a mechanic and I know the RMS may fail at any mileage*
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