'03 325iT Mystic Blau
If the fastener was going to fail because you stretched it too much it likely already would have. I'd leave it for now, but check tis for fastener torques first, or at least consult a torque chart for fastener size and grade. Even 12.9 grade M8 is only 43Nm.21Nm? wow. i knew (felt) too tight.
so, should i loosen? it was on ramp, so weight on the suspension.