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      12-03-2012, 02:47 PM   #11
Volasko
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Drives: 2006 E90 330i BSM 6MT ZSP
Join Date: Dec 2010
Location: Toronto

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I have noticed this too. The only thing I can think of is that the oil is more viscous when it is cold causing more drag on the internal components of the engine, thus reducing power levels.