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Old 01-09-2010, 11:59 PM
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M.Wong M.Wong is offline
E38 E91 (R56 E30 E39)
Location: Seattle WA
 
Join Date: Jan 2003
Posts: 2,323
Mein Auto: The E38
I don't know the answer, but I can tell you I have OEM bulbs and never have that kind of issue. Our temperatures are usually mild, with some hot summer weeks in the 90s and some cold winter weeks in the teens and 20s.
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M.Wong
E38 2000 740iL Orient Blue
E91 2012 328xiT Alpine White

Passed on to new families:
E30 1987 325i Royal Blue
E39 2003 540i/6 Sterling Gray
R56 2010 Mini Cooper S British Racing Green