Quote:
Originally Posted by Dazza335iC
I was referring more to the plastic tabs that hold the thermostat in the housing, than to the materials that make up the thermostat. Those tabs seem to break all the time. Compare that to the thermostat design on earlier BMWs (e30, e34, e46, etc) where the thermostat is the same part but not clipped in to the housing. Those rarely, if ever, failed, because the thermostat material itself is rarely the cause of the failure.
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Okay, thanks for clarification and a good point. My t-stat I just replaced had those tabs intact. The few I've personally replaced had bad/old wax pellets with intact tabs. Different failure modes for different designs. My main point is general and not aimed at you in particular: keep an eye on temperatures because cold temps hurts fuel economy, emissions, and power.