An oil leak is read as energy slowly draining away, often unnoticed until it leaves a stain. Dream books link it to fatigue, a hidden drain on your resources, or a problem that needs attention before it grows.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.