98 Boxster base or 06 base?

[brjak]

Originally Posted by Perfectlap

To the OP, and not to be a jerk brjak, but these numbers though often cited for 2000-2004, are as reliable as ENRON accounting. 96-99 IMS bearings are dual row and fail a lot less often than the single row found in most 00-04 cars. That's all you can really say with any certainty. Those who try to put a number on the number of single row (2000-20004) failures are doing with with woefully incomplete data, and not to mention that the probability of failure has in great part to do with the maintenance and driving habits of 00-04 owners. No two 00-04 Boxsters (still on their original factory bearings) were subjected to the same treatment, especially when a car has changed ownership numerous times. Also, since most 00-04 Boxsters did not have their IMS bearings replaced when the clutch was replaced as well, the likelihood that we will see an even greater number of IMS failures, for both single and dual row cars 96-04 is great.
Given enough time, neglect and mileage, even a dual row bearing will fail and with more potential for destruction than a single row.

Point being that if you have a 00-04 car, you should get the IMS replaced while the oil is still free of metal debris and not make the mistake of procrastinating if long-term ownership is the plan. If you have a 96-99 car, you should not pass up the opportunity when the clutch has to come out.
Dual row does not mean ever-lasting row.

Please see the 8th paragraph below.

IMS 101

[Perfectlap]

Originally Posted by brjak

Please see the 8th paragraph below.

IMS 101

^These figures cited during the class action litigation are not representative of the total number of IMS failures, nor do the plaintiffs' lawyers, or Porsche the defendant, claim so.

The plaintiffs lawyers in that case were using figures that Porsche produced during discovery of documented failures as part of their engine replacement program. Porsche did not replace a majority of the engines that have gone down due to the IMSB failing and Porsche did not claim that they were alerted to all of the failures that occurred during the scope of that ligation. Nor is there any certain basis to assume that IMS failures continued at those rates after Porsche reported those figures internally.


All that we know for sure, is that single row failures for 2000-2004 are far worse than 1996-1999 Boxsters. When the internet forums throw numbers out there for the purposes of guesstimating how likely one is to experience a failure in a single row bearing, we are not dealing with reliable data or reliable conclusions.