It will show how precisely you are familiar with the topic and how much amount of knowledge you have gained in the course of time. (studentsassignmenthelp.com)
Having this knowledge up front can also change the course of your answers to interview questions based on knowledge you have gained about the company while doing your research. (thebalance.com)
It's also amazing to hear the amount of knowledge they have about engines. (humblemechanic.com)