Why does my Audi A6 engine vibrate at high speeds?

I recently noticed that my Audi A6 engine starts to vibrate at high speeds, around 80-90 mph. What could be causing this issue? Is there a way to fix it?

It is possible that your tires may be out of balance, causing the vibration. I would recommend taking your car to a mechanic and getting the tires checked and balanced if necessary.

Another potential cause could be a misaligned or worn out drive shaft. This can also cause vibrations at high speeds. It's important to have this checked and fixed by a professional as soon as possible to prevent further damage.