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I do a Blackstone every oil change, once I learned of this issue at 60,000 miles (bought the car used at 30,000). I found that my lead came way down by letting it partially warm up every time I drive it, and going easy until it is up to temp. I have 128,000 on it now, lead is acceptable (4 to 5 ppm) and no copper yet. My well respected independent repair shop take the view that replacing rod bearings is a maintenance issue, and does them every 60,000. I may be coming up on replacing the oil pan gasket, and getting to that is half of the labor of replacing the rod bearings, so if it needs the gasket then I will do the bearing prophylactically. By the way, I need to keep this car forever (daily driver) so I follow Mike Millers lifetime maintenance schedule, not BMW's--for oil, that means every 5-7,500, I end up around 5 each time.
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