oil change effect on IMS bearing

Asked by Mar 03, 2015 at 05:16 PM about the 2003 Porsche 911 Carrera

Question type: Maintenance & Repair

As I understand it, the IMS bearing is a sealed bearing and it's failure is related to the
failure of the bearing seal which allows motor oil to wash away the grease.  If that is the
case, what effect does oil change frequency and oil viscosity have to do with preserving
the IMS bearing? (Other than contamination in the oil effect on the seal)

1 Answer


I don't know the real cause, but having changed a number of these bearings, I've never seen a broken or damaged seal on the Porsche original bearings. The new bearings are either one or two row (depending on originals makeup), open cage and ceramic balls. Thus they are open to the crankcase oil. You MUST use the Porsche tools to properly install the bearings. Hope this helps.

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