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This is very intriguing information for me as an E46 M3 owner. I always look for the presence of copper in my oil samples from the S54, but after reading this it looks like I need to be looking for the absence of lead!
In the E46 M3 world, it seems like 100k miles is the agreed upon time to consider bearing changes. I wouldn't have thought the S54s in the Z4 Ms would likely need replacement around 60k..
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