Congrats. You did not mention this in the verbiage but some owners of "late" model A4's do not realize that they are sometimes winterizing only the exhaust manifold thru the by-pass hose. My only thought was with the difficulty in getting the engine to start you may have not run it enough to get to temperature "closing" the t-state and or clamping the by pass hose forcing the glygol thru the block? Just a precautionary thought.
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