You will love this. Most people kill their oak trees without realizing it. The roots are shallow. People who use Weed and Feed products eventually kill their own oak trees, and it takes about 5-6 years. The roots just get poisoned so much they can't live.
Don't you dare. That oak tree never did anything to hurt you. Why do you want to murder it in cold blood?
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them