The power steering fluid in your Subaru, pressurized by the power steering fluid pump, provides the hydraulic power needed to turn your wheels. Flushing out the power steering fluid and replacing it with fresh fluid at recommended intervals is an inexpensive way to preserve and protect the more expensive components of the power steering system. If left unchanged for years, contaminated power steering fluid can ruin the pump or, worst case scenario, damage the rack which are both expensive components to replace.For most vehicles, every 30,000 miles is a reasonable interval to have the power steering fluid flushed and replaced. The owner's manual for your specific Subaru will contain recommended interval information for this beneficial service or you can ask any of our friendly service advisors. If you've been driving with the same power steering fluid for more than the recommended number of miles, you should schedule this service right away.