The video shows a close-up of a car's engine. The engine is dirty and has various components attached to it. A person's hand is seen holding a gauge and placing it on top of a container. The gauge has a clear tube with a green liquid inside and a black handle on top. The person then rotates the handle, causing the liquid to move up and down in the tube. The gauge is then removed, and the person rotates the handle again, causing the liquid to move up and down once more.