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Message: <blockquote data-quote="selespeed" data-source="post: 207185" data-attributes="member: 1388">i don't think what you said is true. and how is it that running even SLIGHTLY below optimum temperature would increase wear? on a cool rainy day, the steady temperature would drop and does that mean there is more wear? care to explain? fixed life span of about 3 years for a thermostat? so BMW has to change this thing after 3 years for new owners? did you make this up yourself? i have had mine for more than 4 years and in previous cars more than 8 years and no problem. and yes, the thermostat is working... when the fan failed to work last week, the temperature immediately went up!</blockquote>