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Quick Verdict A surface closer that is actively leaking oil has failed seals, and the fix is a new body, not a refill. Hydraulic closer bodies are sealed at the factory; once fluid is on the door, the floor or dripping off the cylinder, the closer loses control of sweep, latch and backcheck and will slam. A light film on a closer that still controls the door normally is residue: wipe it and monitor. Before ordering, read the label for brand, seri… Read more