Prestone Power Steering Fluid: All Vehicles, Anti-Wear Protection, 50k miles, 32 oz. Part # AS261Y/1. (108 reviews) 30 day replacement if defective. Add A Vehicle to Check Fitment. Power steering fluid is an essential hydraulic fluid that will keep your car's steering in optimum condition for longer. Not only will it improve your power steering, but it also helps to lubricate the system and avoid corrosion. When you drive your car for extended periods without topping up your power steering fluid, it can cause damage and mlvkw.