Posted on 2/27/2026
When most drivers think about vehicle maintenance, oil changes and tire rotations usually come to mind first. Differential fluid, however, often flies under the radar—even though it plays a major role in how your vehicle moves, turns, and stays stable on the road. Ignoring it for too long can lead to expensive repairs and noticeable performance issues. Understanding what differential fluid does and how often it should be replaced can help you protect your vehicle and avoid unnecessary breakdowns. What Is Differential Fluid? Differential fluid is a specialized lubricant designed to protect the gears inside your vehicle’s differential. The differential is a mechanical system that allows your wheels to rotate at different speeds, especially when turning. When you make a turn, the outer wheels travel farther than the inner wheels. Without a differential, tires would drag, skip, or lose traction. Inside the differential are gears that are constantly under pressure, friction ... read more