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Same issues in Europe... I have a brand new G31, 530e xDrive. As it is a plugin hybrid I can test it without the gas engine running. I can report that in my case it is not the engine. Both running the engine and in full electric mode the noise starts at about 100kmh (60mph) and peaks at 120kmh (75mph). I have Michelin Spot Pilot 4.
Sales advisor told me to book a test ride with the head mechanic. According to him small chance it is the tires. We had some snow couple of weeks ago. He says it could be part of the undercarriage that got loose due to build up of snow. That part is now vibrating because of wind at higher speeds.
Hope they find it soon and we are not of on some wild goose chase. I you guys make any progress, please share. Can help with pointing these mechanics in the right direction :-) Thx
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