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Not wide enough bearings in addition to high reving engine (bet most owners use the entire rev range often) and thick oil (if cold started often) contributing to faster wear. No surprise the bearing will wear faster than in most engines.
If you have a S54, S65 or S85 equipped car as a daily driver I can see the problem. But if you have the car as an enthusiast car and seeing the engine is basically a race engine I think the cost of replacing the rod bearings are acceptable.
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