FWIW, I have the same vibration. Mine happens in the 30-40mph window on anything beyond a light throttle.
It also happens around 75-85 on heavy throttle.
I'm thinking too much torque through the driveline, combined with diesel engine harmonics. Hopefully nothing serious, as it has always done it and is not getting worse with time or mileage.
Definitely subscribed!
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GLK 250 // 126xxx miles // 36 MPG // Mobil1 ESP 5w30
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