You do it when its warm and after giving the oil time to settle back into the sump.
Nothing definitive on this but I run the engine to temperature ( i.e. after a run ) and then give it five minutes after switching the engine off before checking the level.
You also need great eyes and a crystal ball if you are to make sense of the Audi dipstick, very poor design indeed and not user friendly.
I always practice that you have to check the engine oil when the engine is cold as the oil needs to drain into the crankcase for an accurate reading.
This is not true for modern engines though and you can read when the engine is stopped for over 10 minutes.
I will still check in the morning when the engine is cold though!
And yes, the B7 dipstick is tricky to read!
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