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      07-14-2020, 11:17 AM   #2
zx10guy
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Drives: 2013 135i
Join Date: Feb 2014
Location: DC

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My coolant level started going down because there was a crack in the expansion tank. I heard this is another pretty common failure point in these cars and my car is much newer than yours.

If you think you might have a head gasket issue which I haven't really seen too many of, you can get a combustion gas tester to be sure. It's a chemical that changes from a blue color to a yellow color in the presence of combustion gases. The fluid gets loaded into a turkey baster type device. You just push one end into the expansion tank with the bulb squeezed and release to draw in air from the tank. Very easy test to do.
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