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Message: <blockquote data-quote="bimmerman" data-source="post: 50285" data-attributes="member: 126">BMW engines are programmed to run hotter than other engines. But the funny thing is that they don't tolerate heat underhood. So the only way we can enjoy our cars is when it's cool outside or how about this? Airscoop! Airscoop anyone? Or gills anyone? It can make a huge difference in underhood temperatures I tell you! By the way, my engine now makes that tappet like noise for longer durations when it gets hot. Used to be about 1 second of rickety tickety tick but now I can make it rickety tickety tickety tick for about 5 seconds if I hold the throttle at about 1,800RPM under load.  And only when hot. UDM? I'm beginning to think otherwise :dunno:</blockquote>