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Yes, the power steering reservoir contains a filter. How effective is it? Don't really know. If the filter was clogged, your steering would be consistently unassisted regardless of speed.
Something worth investigating. The SPS system provides full steering boost at a stop, and then gradually diminishes the assist as speed builds. It uses a solenoid (Y10 below) on the rack to modulate oil flow. Does your steering lighten up if you're moving slowly?
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
