[AndDown]

I have the B48 engine and have topped it up twice from just below the minimum level, car has 8K miles. Our other car has the N20 engine and it has not dropped at all in 28K miles. Don’t know why BMW went to the all black opaque expansion tank with the B-engines, unlike the N-engines which have a translucent tank which makes it much easier to see without having to remove the filler cap.