Will the Aero 2 Towing Mirrors affect my existing OEM mirrors by;

Scratching or harming the finish?

The instructions do state that the towing mirror may mark the factory mirror finish. However, the wedge that holds the mirror in place comes with an adhesive backed felt liner to help protect the finish. The tightening knob on the back should be tight enough to secure the mirror but avoid over tightening as damage to the OEM mirror may occur.

Making wind noise when attached?

The mirror is designed with aerodynamics in mind to prevent wind noice and vibration. You may still experience some noise and vibration, expecially with a cross wind but the shape of the mirror is such as to make noise and vibrations as little as possible.

Impeding the funtional use of my mirror operation adjustment or fall of when the door is repeatedly opened or closed?

With the towing mirror attached, it will not interfere with the operation adjustments of your existing OEM mirrors. The mirror may need to be adjusted at times due to tightening or repositioning for safe viewing purposes. As for opening and closing the door of your vehicle it would be suggested to give the mirrors a quick check before entering the vehicle if needed.