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I have a 2011 E92 ZCP bought at 73k miles and now sitting at ~81k. Purchased from Carmax with a warranty up until 125k, original rod bearings. While I wouldn't call this high mileage (more like 100-120k for these E9Xs, depends who you ask), the only component that I can tell is fatigued is the differential. I would love to have this replaced on warranty or rebuilt at some point. I can tell it still works on track, but drive on a new diff and you'll notice how much more the rear end wants to come out.
I might have the RBs done around 120k. Service advisor at my local BMW dealership said that he had an E90 come in with spun bearings and Carmax paid in full for a remanufactured S65 straight from Germany, for a total of $25,000. Despite the hassle, a new engine sounds pretty sweet.
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