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      04-17-2012, 06:56 PM   #9
MKE_M3
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Drives: 2011 e90 M3
Join Date: Feb 2009
Location: Milwaukee, WI

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If you can't tell you need them, you probably don't. They really don't go from perfect to bad, they degrade slowly over time. I'd guess 50-80k is a good time frame to consider replacement.
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