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Discussion Starter #1
I was replacing the oil in my 2013 328i E93 and noticed that my coolant expansion tank cap was loose-ish. I was able to spin it pretty freely with my hand. I opened the cap and noticed that my coolant level was low - the floating stick was below the cap level.

I refilled about a half liter of fluid and tightened everything back up. I've been checking the cap for a few days now and it hasn't loosened up.

Anyone think that this is something more than a on-off occurrence? Would getting a new cap be a good idea?
 

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Eh, I replaced mine, then replaced both o-rings on the cap.
It's just a bad design, the water level likes to stay low in the reservoir, stick in mine always stays below the opening.
 
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