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The 2011 GMC Acadia requires Dexron ATF for its power steering system. When conducting a full flush and replacing the fluid, you can use any fully synthetic ATF+4 fluid that will be compatible with the power steering system. It's crucial to avoid mixing different types of fluid in the power steering system as it can harm the lines and reduce its effectiveness. Additionally, it's recommended to check the power steering fluid levels each time you change your vehicle's oil. If you observe any power steering fluid loss, it's advisable to inspect all the lines and fittings for potential leaks.
The 2011 GMC Acadia requires Prestone full-synthetic power steering fluid specifically designed for American cars.