Quote:
Originally Posted by Rob175
The owners told me to NOT be concerned. They have only seen a couple in all the years they've worked on Porsche Boxsters..
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We yes you have dual row bearing and those last longer than single row bearings. So much so that they were left out of the IMS litigation and settlement that focused only on single row bearings cars (2001-2004).
But all bearings will eventually fail, and sooner than later if they are run with contaminated oil or are starved of oil. Your mechanic has seen very few IMS failures simply because for most owners these are not daily driven cars until the second or third owner comes along and starts ramping up the mileage faster.
The IMS bearing, dual or single row, should be replaced after a certain amount of mileage, the problem is no one knows this amount of mileage because it changes dramatically depending on the sort of driving you do, the oil you use and the frequency in which you change the oil. Some forum members here have put 30K miles a year on their cars for 10 straight years and are still on the same IMS bearing (although this particular owner maintained strict mainteance standards). While others have had failures at a fraction of that time with barely 1K miles per year.
A dual row bearing basically has a longer shelf life than a single row if both are equally absued over the same period of time.
But the root cause of the issue is still present (the fact that there is a sealed bearing in there at all). The best remedy is to remove the bearing completely with a no-bearing design alternative, replace it with a fresh bearing or replace it with a fresh bearing in combination with a direct oil feed modifcation. In the last four years on this and other forums since remedies became available, I can't remember a single person ever indicating they had a failure after one of these three things was performed.