Of course it is 5.5L recommended. Then you remove the bung and let almost a litre drain out!
They are selling six litres because the advice is to fill it with 5.5L. I can see the boardroom presentation ... "even though only 4.6L is required, all we have to do is sell an extra litre for each service and we make millions more! We get our bonuses and the dealers make more money!"
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