Resonance in my G31 | 520d | 31,000 miles

[NevoBMW320i]

Indeed, I transitioned from my previous 520d to the current 520d, which has 31,000 miles on it. And you believe that everything will improve. However, I was profoundly disillusioned.

I proceeded towards the highway and saw that the automobile exhibited instability between 70 km/h and 120 km/h, accompanied by a persistent hum (a “brrrr” sound) that happens in a steady rhythm, significantly diminishing the driving experience.

Account of the subject matter:

It produces a sound like "brrrr...brrrr...brrrr." A negligible gap appears between each "brrrr"/hum. The music does not accelerate with increasing speed, seeming to adhere to a constant beat. At speeds beyond 120 km/h, my ability to see it diminishes significantly, and it appears to vanish, maybe due to the rushing wind.

- The music remains consistent in rhythm, irrespective of acceleration or RPM.

- The hum maintains a consistent beat at 80 or 110 km/h.

- Operating the vehicle at speeds of 80-110 and disengaging the engine does not fix the issue.

- Operating a vehicle at speeds of 80-110 mph while in neutral. The sound persists, and acceleration proves ineffective.

- It seems somewhat detectable in the steering wheel, however not in the same cadence.

- The noise seems to emanate from underneath the driver's side, towards the front (rather than the back).

- The sound and sensation in my steering wheel are imperceptible below 60 km/h and over 120 km/h.

- Not discernible when stationary, even during engine revving.

    At speeds over 130 km/h, wind noise predominates.
    At speeds below 60 km/h, I cannot perceive or hear it.

- Replaced the four wheels and tires. No enhancement.

It is entirely undermining the tranquil driving experience at speeds between 75-115 km/h.

Do you possess any insight, gentlemen?

[CelestialSeeker]

Propeller shaft central bearing?

[NevoBMW320i]

With 31,000 miles? I will verify that.

[blueWING007]

This seems to be a prevalent issue with these items.

[blueWING007]

Additional information available here

https://g30.bimmerpost.com/forums/showthread.php?t=1512720&highlight=vibration

[NevoBMW320i]

I also produce a pronounced low resonance sound, akin to a brrr brrr noise. It is imperceptible below 60 km/h, but becomes distinctly audible at around 100-105 km/h. It has a same vibration/rhythm.

[Starcar2022]

Is there absolutely no brake binding?

[nickoyster4]

I had a like incident with my own. Ultimately identified as a bearing. Front right in my situation. The noise was incessant and varied in tone according to pace. However, it remains consistent at around 40 mph. It was first diagnosed. Unless you are doing the procedure yourself, I recommend obtaining a diagnosis beforehand. You should avoid altering unnecessary components.

This is only my experience; do not see it as definitive, nor presume that my issues will mirror yours.