Yes and if you would notice all of their cars really have the grill trade mark. I wonder though if it has any special contribution to cooling or any other special contribution aside from aesthetics.
Have you checked if there is a problem with the head gasket or there is a block between the water jacket and cylinder?
In any case, you might want to fix that coolant problem immediately because eventually it will overheat your engine probably due to lost of coolant or something.
For some reason there are instances when my sedan would emit black smoke. I have already checked the engine and found nothing. I don't smell anything bad like fuel leakage or something but I still get instances when my 7-s sedan emits black smoke.
Any ideas?
You might want to have that checked by a shop. As Albert has said, it could be a problem with the oil cooler or the sensor. I know there are some shops that offer free estimates. You might want to have them check it first.