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Originally Posted by ILUVMILS
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Oil level should be measured after the car has been sitting for a while... If you measure the oil on the dip stick immediately after shutting it down and several hours later you won't get the same level. That's because a lot of the oil all over the engine slowly drains down to the crankcase, which is the only spot the dip stick measures in. Granted it's not much of a change, but it's there. You can actually over-fill engine oil by "topping it off" when it's running or freshly shut off. Don't ask how I know... :-)
Making sure the car is level is more important though.
I don't see how synthetic vs. dino would have anything to do with it. That should be totally irrelevant, although heavier weights would slow down the process and thinner oils would speed it up.
Back to the original subject though - as long as there is oil on the dipstick's range, the engine will be fine. Just fill it up to the center of the range.