I read an interesting article on synthetic oil and breakin on Ducatti's website. It basicly said that once the rings seat, any interferance problems should have the slipperiest oil. The rings should seat immediately and if they don't the glaze will never go away. There is no need to wait hundreds of miles. That's why Viper,Vette Z06, ...come with synthetic from the factory. I use mobil 15w50 in the hp &-turbo stuff,10w40 in the regular stuff-older. 5W in anything new.