Quote:
Originally Posted by Red Bread
Idling is not necessary for cool down as BMW use pumps to circulate coolant and oil after the engine is turned off and it controls the cool down for you. I've walked into the garage after a highway trip with our old 135i and heard the pumps running over an hour after we got home.
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From my understanding, the oil pump, while electrically pressure/volume controlled during operation, is still mechanically driven. So, it doesn't run when the engine is off.