Seen a fair few leak from cracks in the filter housing cap. Never had it happen to any I have done so I can only assume it is from over tightening it.
Get it sorted asap and you shouldn't have any issues. Level likely hasn't dropped a whole heap as it will throw warning lights/limp mode etc if the pump can't get the system up to pressure.
Drop me a PM if you need a price on the cap/seal or the DSG service itself.
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