You have EXACTLY what you need to make your decision:

You have contemporaneous posts from thousands of X5 owners regarding issues with their various model years- posted over the past 6 years.

Yet YOU think you can just say "dont discuss plastic impellers, but DO post your problems and if I can see any repetitive issues I can decide"

I submit that this entire forum is what you seek- but the vastness of the experience has thrown you and you cannot reduce that data in a way that makes sense (god forbid I tell you to "search")...so instead you think that a tersely worded request to readers will give you some meaningful dataset.

Sometimes there are no shortcuts.

A

PS I see no need to call out the lowercase police