Back to oil... not much chat on here that the CF shop manual states 5w-40 or up to 10w-30 can be used in the Crossfire according to the thermo scale, ever use Syntec synthetic 5-40 blended for euro cars including MB, BMW etc. , to me Mobil in the owners manual is a sponsor promo, albeit its still a good oil , 0-40 seems a little thin, as synthetic oil molecules shear they are reduced to a lower weight so that would be a negative with 0-40 ,... oil is a never ending story ....