I see none.
Half a liter seems like a lot. That's the difference between the high and the low mark on the dip stick. Are you sure the dipstick was pushed in all the way when you took the first measurement? I had a very similar issue and I hadn't pushed in the dip stick until the "click", and my oil was reading low and I thought it needed a top up. I went and bought the expensive Castrol oil, then realised my dipstick wasn't all the way in. Checked it again and it was fine. Now I have an expensive 5L container of oil I've never used.
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