IMS tell tale

[78F350]

Originally Posted by mikefocke

The only problem with using the figures from the class action lawsuit is that those figures were out of date the day after they were written, more so by the time they were submitted to the judge, more so by the time they were published. Not to mention that they were even wrong when compiled because Porsche didn't see all the failures via their dealers as people were swapping engines from wrecks in via indies or by themselves long before the IMS publicity that lead to the class action lawsuit. Many of the cars were out of warranty so lots of folks abandoned the dealer network especially since they were less than helpful on the issue of engines with ground up bits of metal in them.

Since the time of the compilation of the figures by the lawyers for Porsche, the long time to settle the lawsuit has elapsed plus more years and miles on the cars since then so even via normal wear the figures would be higher by now. Which is why I try to answer the question in terms of per car/per year estimates. ...

Then factor in how many *would have* failed by now, but were preemptively replaced. No doubt the failure rate for the single row bearings is above 10% if you consider all factors. Also if you have thought there was a mileage point after which you could assume you were safe, that has also been dis-proven by some of the ~100k mile failures reported on the forum.

The analogy of the timing belt is a good one if you don't get too anal about the details; Consider it a regular maintenance item per mileage interval, based on your chosen solution. ...or just hope it lasts till you reach another 'mode of failure'.