I can verify that the cap fixed my problem 100%. I was finding that the unit would some times start up at the wrong "dimness" setting. Going to the dimmer menu and adjusting the dimmer by 1 notch and back again and the dimmer would be at the right level. After the cap, I have never noticed it start on the wrong level.
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Christian
#40104192 120Gb (no longer in my E36 M3, won't fit the E46 M3)