Quote:
Originally Posted by Lupin..the..3rd
I read somewhere that BMW used plastic impellers, that over time would become brittle and crumble apart. They've since switched to some kind of more durable composite, that's superior to the plastic and doesn't suffer from the same problems. I also went with OE composite pump when I did mine a few years ago. Nice thing about E46, is the water pump is very easy to access and swap out.
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Bet you $50 I read the same threads as you did

. Went for the composite water pump for the same reason.