It's not irrelevant! Well done for ignoring my point...total power output has no relevance to what I'm saying, at all. It's about the engine's state of tune.
A more highly strung engine will need greater care, a lower one will not. Yes, 560 bhp is a nice number, it's a big number and in your car the grunt must be epic, that's not in dispute, but when it comes from 4.4 litres it's really nothing special and certainly not enough to warrant a special oil and early change when so many others manage without it.
Is it not just ///M tax? I've still not heard even the most basic justification of why this particular engine needs it? Tell me its internals are made from titanium and gold and it's therefore essential because of some bedding in procedure and it'll make sense to me, but 'because ///M' is no justification at all!