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How long had it been since the last oil/filter change? The filters are 'supposed' to last to the 15k mile interval BMW specifies, but...well ok, I won't get into how freaking stupid the 15k mile oil change interval is.
What happened to you is generally caused by an oil filter being used for too long of a time.
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Eric Giles
'04 M3
'07 X5 3.0si
Many others.
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