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I had it checked out yesterday. Pressure tested and leak tested both came back negative. No visible leaks either.
The cooling system on the X1 is quite complicated as there are a series of valves. It doesn't only cool the engine but also separate pipes to cool the turbocharger. (28i) It's also very important to use the OEM BMW coolant as some of the cheaper brands will literally burn out when cooling the turbocharger.
So either the engine is burning coolant or because it was a cheap aftermarket coolant used it's burning out. I'll get a flush and oem coolant put in next week.
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