Firstly, make sure it's pure. To get it to perform as well as expected, avoid anything with synthetic ingredients. They inhibit the benefits of a pure oil formulation
Secondly, whatever your skin type, and that includes oily/combination/blemished skin, don't be afraid to use oil on the face. It not only nourishes but also balances and helps to clear and brighten
Thirdly, use it as your last layer of skincare and apply generously at night. Even better, spend 10 minutes relaxing and massaging the skin with a facial stone after applying your oil.