Which of the following is a step in replacing spark plugs?

Applying an anti-seize compound is an important step in the process of replacing spark plugs. This compound is used on the threads of the spark plugs to help prevent them from seizing in the cylinder head due to heat and corrosion over time. When spark plugs are inserted, the anti-seize ensures that they can be easily removed later, which is especially helpful in areas with high temperatures or where the plugs are made from materials that may bond with the aluminum of the cylinder head.

Using this compound reduces the likelihood of damaging the threads when removing the spark plugs in the future, allowing for easier maintenance and servicing of the engine. The application is typically done to the threads of the plug but should be avoided on the electrode or insulator tip to ensure proper functionality.

The other options discussed do not pertain to the typical process of spark plug replacement. Draining engine oil is necessary during oil changes but is not part of spark plug replacement. Removing battery terminals is usually related to electrical work, providing safety when working with components that may conduct electricity, but it’s not standard practice for changing spark plugs. Flushing the radiator relates to cooling system maintenance and does not connect with the spark plug replacement procedure. Thus, applying anti-seize compound is the essential step