Yes, a scalp massager can be beneficial for oily hair. Oily hair occurs when the sebaceous glands on the scalp produce an excess amount of sebum. Using a scalp massager during shampooing can help to distribute the natural oils evenly throughout the scalp and hair. This can prevent the accumulation of excess oil in certain areas, reducing the appearance of greasiness. Additionally, the massaging action can stimulate blood circulation in the scalp, which can promote a healthier scalp environment and potentially regulate sebum production. However, it's important to note that a scalp massager alone may not solve the issue of oily hair. It should be used in conjunction with a suitable shampoo and hair care routine tailored to address excess oil production.