You would be fine as long as you changed it very frequently. DINO degrades very quickly as compared with SYN oil, say a change per 5K vs 15K as recommened for the 986.
Also, your engine would run hotter and you gas mileage would decrease say 1-2 MPG. As the oil got older viscosity would vary greatly also from as new.
Basically, DINO sucks when compared to the alternative.