oh come on guys,,, it's purely marketing. With so many Veyron oil changes taking place around the globe, Castrol is making a killing from the sale of this liquid band-aid. We all know that Castrol isn't even a oil company but just a 'blender' who mixes together stuff that they buy from other companies.
Heck, I bet Castrol pays Bugatti to put that sticker on there and gives the factory free product. And if any modern designer doesn't use 0W-20 then they're just not building a good engine. Heck, my Honda Civic thrives on 0W-20... if my Bugatti Veyron can't do the same then it shows that Honda is just a superior engine builder.
Yeah,, liquid band-aid.