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https://www.youtube.com/watch?v=T4Gp1vNgOLcThe power steering fluid and filter are one of the most overlooked preventive maintenance areas on most BMWs and MINIs.
Running on old, degraded fluid will shorten the useful life of the steering rack/gearbox, brake booster, fluid pump, etc. The fluid should be bright, clear red or, depending on the application, just clean and clear.
One of the reasons this system gets overlooked is that there is no direct provision for changing the fluid; therefore the job is a bit more tedious. But it is not so tedious that it should be ignored. We recommend a biennial (every other year) or 50,000-mile fluid change for the power boost system. Additionally, most systems have a fluid filter incorporated into the fluid reservoir. (A lot of mechanics do not even know that this filter exists!) Change the filter when changing the fluid. (This is also a great time to replace any leaking power steering hoses.) There are three different fluids used in BMWs and MINIs; the correct fluid is typically noted on a label on the reservoir cap.