[lawjai]

Hi guys. Got my x5 a few weeks ago. I have never owned a bmw or a turbo engine before. I have a question regarding with this n55 engine as it seems to rattle and vibrate on the steering wheel when I'm at a red light. I have owned other cars, they rattle and vibrate more when the AC is on as heavier workload is on the engine. Is this a normal thing for a n55?

I normally just put 91'gas that contains 10% ethanol. Just yesterday, I tried to put in 94 gas that contains no ethanol, the vibrate and rattle seems to be a lot lighter and acceraration is more responsive.

Could this be a gas issue? Or the vibration a normal thing for this engine/car.

Thanks for the help!!