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The 2005 -2008 M97 engines with the larger IMS bearing can have the bearing replaced. But only if the engine case is disassembled and split in half. So then you are rebuilding the engine. With all the new gaskets and other things that have to be replaced just to disassemble and reassemble, you may as well be replacing crank and rod bearings, rings, timing chain tensioners, etc. and checking valves, guides, cylinder bores to see if they are within spec. The idea behind the bigger bearing was that its larger diameter speeds up the movement of the ball bearings at any given engine rpm vs the smaller diameter bearings that were replaceable with the engine assembled.
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