1. Increased Damping Force: The primary purpose of a damper in a car suspension system is to control the movement of the suspension by dissipating energy and preventing excessive bouncing or oscillation. A more viscous fluid inside the damper would provide a greater resistance to flow, leading to an increase in the damping force. This means the suspension would be more resistant to movement, resulting in a stiffer and less comfortable ride.
2. Slower Response: The increased viscosity of the fluid would also slow down the response of the damper. As the suspension encounters bumps or irregularities on the road, the damper needs to react quickly to control the movement. With a more viscous fluid, the damper would take longer to react and effectively dampen the oscillations, leading to a less responsive and less controlled ride.
3. Reduced Comfort: The increased damping force and slower response would result in a reduced level of comfort for the passengers. The suspension would be less compliant, transmitting more road noise and vibrations into the cabin. This would be particularly noticeable on rough or uneven roads, making for a less pleasant driving experience.
4. Reduced Handling: The slower response of the damper could also negatively affect the handling of the vehicle. The suspension would be less able to adapt to changing road conditions, compromising the vehicle's stability and responsiveness. This could be particularly problematic during cornering or evasive maneuvers.
5. Increased Wear and Tear: The more viscous fluid would put additional strain on the damper components, including the seals and valves. Over time, this could lead to premature wear and tear, potentially reducing the lifespan of the damper and requiring more frequent maintenance or replacements.
In summary, replacing the oil in a car suspension damper with a much more viscous fluid would result in a stiffer, less comfortable ride, reduced handling capabilities, and increased wear and tear on the suspension components. Therefore, it is not an effective modification for improving the performance or longevity of the suspension system.