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      12-01-2012, 12:11 AM   #10
Tee-Dub
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Drives: 2008 135i
Join Date: May 2009
Location: Vancouver, WA

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If you were at 50k on original plugs it was past time to replace them all, especially if you're tuned. I've heard guys recommend every 25k on a tuned car. BMW says 45k as a stock recommendation. Running a tune will show weaknesses in your ignition system from what I've been reading.