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I've owned BMW's for 30 years now, always followed the on board computer recommendation for oil changes. My E46 sometimes went 18k miles between oil changes. Even at 18k miles, the blackstone lab reports came back saying the oil was good for continued use and there was minimal to no wear metals.
Never had issue with engine even at 175k miles when I sold it. (Would've kept it longer except we needed a bigger car for baby stuff).
You can't go wrong by following the mfg recommended service intervals.
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