Similar question appears on this link on http://goaskalice.columbia.edu/answered-questions/what-can-i-do-take-care-my-very-oily-hair-and-skin and the remedy includes leaving shampoo to soak rather than wash off straight away and also making sure you don’t moisturize oily skin.

sometimes a change in diet can also assist with this, I notice when Im on a full health kick, my hair always seems to look healthier, cleaner and doesnt get oily.

Hi not sure on your age, but I can say that over time our skin and hair and they way our body produces and absorbs oils changes too. I recommend a quick trip to your favourite beauty counter, I highly recommend Kiehls, and ask to speak about products best to suit you. ( Kiehls will almost alway give you samples to try ) Sometimes, you have to change products to suit your own changes. Sticking to the same ones always, isn’t always best for you. good luck xo

At times and it has been hormonal.

Sometimes trying to wash your hair less during the week can balance out your hair’s oil production. It does mean you have super oily hair for a few weeks while it resets it’s production rate – I did this not long ago and just tied my hair back and wore a scarf or clips. It took me about 3 weeks but now I only need to wash my hair twice a week rather than every day.