2007- 2008 ims bearing.

[A1VDY]

I realise the ims has gone though several modifications ie twin row bearing up to 2002, single track bearing up to 2005 and large single track bearing up to 2008/2009 until the introduction of the MA1 engine 2009 onwards.
Has anyone had problems with the later large diameter single track bearing circa 2008models 987 engine?

[Andyoz]

I've read they estimate chance of failure on the later bigger IMS bearing is 1%.

Earlier one is around 8% but not sure how correct these figures are.

Later bearing is much harder to replace so most just leave it....remember that say a BMW engine can also catch you out so no engine is 100% failutre proof so have to weight up all the odds.

Smaller bearing is easier to replace so most do it during clutch change.

Anyway, I have a 2006 and don't worry about it and just drive the thing (hard as well at times)