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Message: <blockquote data-quote="6099" data-source="post: 207146" data-attributes="member: 6233">Too cold becos thermostat is stuck open (if it indeed is) can't be a good thing.Let's say u are coasting downhill for a long time or encounter cool ambient temp (like a sunless gloomy rainy day) your radiator is getting rid of more heat than the engine can produce, so sensors will read as engine not warmed up to operating temp and will increase fuel volume. So ur mileage may suffer. Furthermore stuck open thermostat means engine takes a longer to warm up, same goes for the engine oil. Cold engine oil is not good! In the long run, accelerated wear and tear.ok hope I am helpful. BMW noobie talking, but at least that's the universal theory.</blockquote>