What visual signs indicate a potential wheel seal issue?

Oil and stains inside the wheel are significant visual indicators of a potential wheel seal issue. When a wheel seal is compromised, it can allow oil to leak out from the axle, leading to the accumulation of oil and stains around the wheel area. This visible oil indicates that there may be a failure in the seal, which could result in decreased lubrication for the wheel bearings and increased friction, ultimately leading to more severe mechanical problems if not addressed.

The presence of oil and stains is important because it suggests that the wheel seal is not functioning correctly, and immediate inspection and potentially replacing the seal could prevent further damage and ensure safe vehicle operation. Detecting this issue early can prevent significant repairs and maintain the vehicle's overall integrity.