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AFAIK the main idea behind the controlled thermostat is to lower combustion temps in order to meet Nox emissions specs without using an EGR valve(bonus for cost and reliability). So what ever time the DME drops the temp is probably what is needed to average the Nox emissions to meet spec.
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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)
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