Recommendations for checking your fluid levels vary between once a month and once a year. If you notice a change in color, a burning smell, or particles in the fluid, then the fluid needs to be changed. Similarly, if the power steering fluid pump begins to make noises or steering your vehicle at low speeds becomes more difficult, then these are signs that you may need to change your power steering fluid. You also need to check your vehicle’s manual as this will give you the specific fluid changing intervals for your make and model of car. While each fluid will recommend a changing interval, you should be guided first by your vehicle and the recommendations of the vehicle manufacturer.