* Fluid can be forced out of the reservoir: The pump churns the fluid and, if the reservoir is full, the fluid will be pushed out through seals and potentially onto the engine or surrounding components. This is messy and can lead to further issues.
* Foaming: The excessive fluid can create foam in the system. Power steering fluid needs to stay as a liquid to transmit hydraulic pressure correctly. Foam is compressible and reduces the system's efficiency. This results in poor steering response, making steering feel spongy, sluggish, or difficult.
* Damage to the power steering pump: The extra fluid can overwhelm the pump, forcing it to work harder and potentially causing damage to seals and internal components. This can lead to premature pump failure, a costly repair.
In short, it's far better to slightly underfill the power steering fluid than to overfill it. Always refer to your owner's manual for the correct fluid level. If you're unsure, it's always best to take your vehicle to a qualified mechanic for service.
