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The third edition of the IMS bearing used by Porsche from late 2005 is not essentially the same as the LN ceramic bearing: it is neither unsealed, nor ceramic, but rather is a larger, single-row steel bearing. Unlike the earlier single-row and much more reliable dual-row IMS bearings, it also cannot be replaced without disassmbling the engine. It can, however, beneift from direct oiling.
Brad
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