Which practice best reduces wear in a hydraulic system?

• A. Using dirty oil to protect seals
• B. Using clean oil and regular changes
• C. Operating with the system at maximum temperature only
• D. Extending oil changes beyond recommended intervals

Answer: (B)

Maintaining clean hydraulic oil and changing it regularly keeps wear to a minimum by preserving a strong lubricating film, preventing abrasive contaminants from circulating, and keeping additives and viscosity at the right levels. Clean oil reduces metal-to-metal contact in pumps, valves, and cylinders and protects seals, while regular changes remove dirt, moisture, and oxidation byproducts that accelerate wear and corrosion. When oil stays clean and is refreshed on schedule, the system maintains better lubrication, cooler operation, and longer component life. Conversely, dirty oil introduces particles that grind surfaces, excessive temperature alone doesn’t prevent wear and can degrade oil, and extending oil-change intervals lets contaminants build up, increasing wear risk.