I suggest that you get Mike Miller's Old School BMW Maintenance Schedule, particularly if you're intending to keep your car for awhile. You can request one through Roundel or Bimmer magazine. The Old School BMW Maintenance Schedule recommends for M50, M54, S50, S52 (US spec) six cylinder engines a "new water pump, thermostat, plastic thermostat housing if so equipped" every 60000 miles.
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