Why does my Audi A6's engine shake at high speeds?

I have noticed that my engine starts to shake and vibrate when I am driving at high speeds on the highway. I have checked my tires and they seem to be properly inflated. What could be causing this issue?

It is likely that your engine's motor mounts are worn out and need to be replaced. The motor mounts are responsible for absorbing the vibrations of the engine, and when they are worn out, the engine can shake at high speeds.

You may also want to check your spark plugs and ignition coils. If they are old or damaged, they can cause your engine to shake and misfire. Replacing them should help resolve the issue.