How to care for very oily hair?

I would try a conditioner that you keep in your hair for over 3-5 minutes to allow it to soak into the scalp. Then, allow it to air dry, and when it is just damp, add a nice serum all throughout your hair...because you want to create a "halo effect" in which a ring-like shine is seen at the top of the head, making it appear healthy.