Modern cars, trucks and SUVs all use power steering to make maneuvering effortless. The power steering system uses a pump and hydraulic pressure to assist the steering gears. Power steering fluid is designed to last for as long as 100,000 miles, but the system may leak or the fluid may become exhausted before then. Follow the recommendation from your owner’s manual to see when it’s time to flush the power steering fluid. A mechanic will flush the system by removing dark, discolored power steering fluid and refilling it with fresh fluid, while an assistant turns the steering wheel from left to right to get old fluid out of the system. When the remaining fluid appears like fresh fluid, the system has been successfully flushed. Remove the remaining fluid, refill with fresh power steering fluid and your vehicle should be good for another 100,000 miles.