Not sure about why its fading especially just in one spot. Never saw that before. But i do now that over oiling a filter will ruin your MAFS. So as long as it was properly oiled the first time. Do not reoil it until it is cleaned. Which should be done every 15k miles usually.

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Dinan M3

2006 X5 4.4i Sport Current Vehicle
2006 CLS 55 AMG Current Vehicle
2010 FORD F-450 King Ranch Current Vehicle
2012 GL 550 Current Vehicle

1999 M3 Dinan S3 SOLD
2001 M3 Dinan S2 SOLD
2002 M5 SOLD
2004 X5 4.4i sport SOLD
2007 335 XI Lease ended
2009 E92 M3 SOLD