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Originally Posted by JCL
It isn't nonsense at all.
BMW know this. That is why they tell you not to idle the engine to warm it up, same as all the other manufacturers.
Yes, lived there. See my posts above. Does north of the 60th parallel count? I also acknowledged that it isn't an option at times. Safety first. 
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I stand corrected.
It seems that one thing to keep in mind has to be the tolerance changes in modern engines. Gone are the 50's, 60's and 70's American Motors.