Don't worry about it. If you put mobil1 0-40 in it then it already has dino in it since the new 0-40 now has base 3 oils (they have stopped calling it full synthetic). That is why I now use mobil1 5-40 full synthetic turbodiesel truck oil, I think that the E-spec European car mobil1 might also be full synthetic but am not sure on that one.
From wikipedia
http://en.wikipedia.org/wiki/Synthetic_oil
Synthetic Base Stocks
Synthetic motor oils have been made from the following classes of lubricants:
* Polyalphaolefin (PAO) = API (American Petroleum Institute) Group IV base oil
* Synthetic esters, etc = API Group V base oils (non-PAO synthetics, including diesters, polyolesters, alklylated napthlenes, alkyklated benzenes, etc.)
* Hydrocracked/Hydroisomerized = API Group III base oils. Chevron, Mobil, and other petrochemical companies developed processes involving catalytic conversion of feed stocks under pressure in the presence of hydrogen into high quality mineral lubricating oil. In 2005 production of GTL (Gas-to-liquid) Group III base stocks began. The best of these perform much like polyalphaolefin. Group III base stocks are considered synthetic motor oil in North America.[4][5]
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