erl evil
BMW uses a thermostat in the oil...it's critical you get it FULLY up to temp before draining, so the oil cooler can fully drain whislt the thermostat is open...it also takes a while for the heads to drain all the oil back to the sump.
the sump level is pretty forgiving...better low than high...reason:
high level can get frothed by the crank throws, and both pistons move in and out together which causes a wide swing in crank case pressure...hense, the breather must be clear and not kinked or such.
the only real "danger" of high oil is it gets blown/sucked into the intake box and possibly in the intakes...which dirties/hampers the port and polish, and more critically, can carbon the valves...possibly foul a plug. less likely is the filter element gets wet and won't pass proper air.
there should be a drain plug at the rear of the intake box...pull it out...if it's wet, it's sucking oil and the level is too high.
IF and I say IF that's the case, take the filter off and drain that much out...and see where you're at.
if you had the cooler empty to begin with, 4 qts should be fine...if you had some capacity hidden in the cooler from closed thermostat, you may have too much in.
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