Dream about mustard oil is a metaphor for how you are doing in life and how you compare to others. You are feeling incomplete. You are dealing with criticism about your self and your body. The dream is an evidence for a sense of stability in your life. You need to return to the basics.
Mustard oil dream represents a sense of belonging and how family looks out for each other. Perhaps you are feeling depressed. You are trying to be more sociable and open. Your dream is a sign for your desires for more emotional freedom/expression and self power. You were completely dependent.
If you dreamt about mustard oil:
A woman, perhaps a colleague who’s very bright and sometimes annoying, could visit you today. If you aren’t careful, this person could goad you into a heated discussion or arouse your insecurity. Try to distance yourself. This person has issues of her own to deal with that have little if anything to do with you. Be polite and understanding and then show her the door!