I re-use these nuts and bolts, zero issues.

Dealer mechanics re-use them too.

On another note, when doing suspension (control arms etc.), the book says replace the bolts etc. but dealer mechanics re-use the bolts. Zero issues.

Many people here are arm-chair generals lol...So stop worrying about these bolts and nuts. They are big, as someone said above and extremely unlikely to break...

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