Almost all of the scrapyards pumps impellers are so loose it is amazing they didn't detach from the pump. My 530 pump was very wobbly, no clue how many miles tho. I think after BMW implemented the don't fix it til it's broke ruined a lot of cars. Just like the lifetime trans fluid. I still go by the old rules and replace stuff before it breaks including flushes of fluids, belts, hoses and everything else you don't want to be stuck on the side of the road by. I have not had any breakdown since this, 10 years ago including anything that runs on gasoline. Preventative maintenance vs break down.
95 E34 530I V2.37
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Those who make peaceful revolution impossible will make violent revolution inevitable.
John F. Kennedy