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As others have said get the exact same 1/2 gallon bottle of add-blue/DEF from VW for $10 instead of $30 from BMW. Use the plastic handle of the screwdriver from the (minimal) tool kit in the trunk to unscrew the lower filler port cap (active tank). Pop the top off the 1/2 gallon bottle, screw into the port, and push in to open the fill valve. Replace the filler port cap when done.
Keep the filler bottle for future use. Unscrew the valve off the bottle (use a lot of force, some plastic will crack but the top will come off) Flush it out with water or any remining urea will crystalize. You can get 1 gallon and 2.5 gallon jugs of DEF from Autozone for about $5 per gallon to refill the special filler bottle. Do not buy more than you need, it has a shelf life.
I got the 999 miles to no start at 2100 miles to service. Added 1/2 gallon and I'm now at 900 miles to service and it has still not come back on. I expect it will on the way for the oil/DEF service tomorrow.
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