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This car oil diffuser is really nice looking and i thought it would be ideal for my new car. You add oil by unscrewing the top part and dripping your chosen oil onto to the wood inside. You can adjust the opening by unscrewing the top during use, however when the car is in motion the top closes by itself so after about 10 mile journey it is completely closed. When it is open it is effective but the screw thread is obviously not tight enough to do the job properly.