The expansion tank for the BMW N20 and N26 turbocharged straight 4 engines looks like a golf ball or radome.
I think it looks pretty neat with the white round plastic over the E90's black square expansion tank. The reservoir in the picture below is from a F30 328i.
My window wash warning came on and I opened the hood to refill the tank. I couldn't find it, but the big white reservoir appeared to look like it. It took half a bottle of washer fluid. My BMW owners manual does not show a picture or even talk about either the Coolant expansion tank or the location and picture of the Washer fluid reservoir. I now have the cleanest coolant on the block. Thanks to your site I have now discovered what that big white reservoir is for. Too bad that BMW cannot provide useful guides to owners.
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