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I was at a meeting with Dinan and he was explaining the issue with the temps in the e90 engines. He said that BMW made the area where the coolant or oil goes (sorry not an engine expert and I honestly forgot if it was oil or water that was the problem) through in these engines smaller so that more liquid would push through faster and therefore continue to cool the engine. However it doesn't work quite like that because there is less liquid in the area so the liquid that is there heats up much faster which is why he says they are having problems with the engine. He said the first thing they are working on is a larger cooler.
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