Thread: Cold start
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      12-12-2012, 10:33 AM   #9
Drives: 335i
Join Date: Mar 2011
Location: My car is my home

Posts: 2,016
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Cold starts heat up the cats so they can operate normally right away.
Wether they heat up in 2 minutes vs 5 minutes wont damage them, it'll just make your car polute more per say, since the cats aren't operating at their full potential.
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