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I'm going on a year after cleaning mine with no problems, its not a big deal more a maintenance item. I plan on cleaning them every 3 oil changes on both my Bimmers. I was amazed at how much better my X3 drove after cleaning the solenoid, night and day!
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2008 SGM 135i Cobb Stage 2 FBO
2008 TS X3 MSport KW V2
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