- If you want to rebuild yourself, then bimmerfest E39 5-series forum has a nice DIY for Valeo alternator.

- Replace the entire Voltage Regulator, not just the slip rings.

- Bearings: Nachi, NTN, not the Chinese bearings.


Anyway, search for that DIY...

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT