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Heavy torque converter spinning and pumps in the automatic running and the car in Drive, heat soaked motor, cooling fans running, A/C compresser running, mechanical water pump running, and air/water intercooler electric pump running. That's a ton of load on a motor at idle. Plus the M sport cars run stiffen engine mounts.
My guess is it's a factor of the two pumps running intermittently. I rent a crap ton of cars for work and most I've rented, both mid grade and lower end luxury makes can have fairly noticeable vibration on a really hot day and the a/c and fans running while the car is in Drive.
Does it vibrate when the car is in neutral?
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