Exactly the same happened to me - a whole 4 litre can disappeared into the engine, and it still wasn't up to the full mark. Solution - I drained it all out again, and refilled with exactly 2.6 litres, ran it for a bit, and then checked the oil level as per the manual. Bang on, just had to top up 100 cc or so.
Unless you run the engine, and then wait for the oil to settle, you will never get a reading that is even remotely correct.
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