I often wonder about fluid quality & the differences China uses, maybe there isn't any. We all know what happens to the antifreeze & brake fluid that many owners leave for years beyond the recommended replacement time frames.
It's not unusually to see antifreeze in that line when the units are brand new, normally it does not develop into anything. Just seen a failure @ 3600km's, it had been perfect to that point. I may still have it & could post photo's if interested.
As far as I know this was original antifreeze.