The process of regeneration of used Shell Tellus T-32 hydraulic oil is studied for selection of adsorbents and purification methods. A combined purification method is proposed: contact purification at room temperature for 10 h using a carbamide-modified basalt fiber, followed by percolation purification using unmodified basalt fiber as the adsorbent. After the percolation purification, the oil can be purified further on a filter having three layers: polypropylene fiber, spherical cinder, and iron oxyhydroxide in a 1.65:1 ratio, and polypropylene fiber.