I don't think my perfect oil exists yet. And it may never.
For me I'd want one with a very stable base oil, which can withstand 25k intervals without missing a beat. It would have a perfectly balanced additive package that kept the engine clean while not dropping the TBN too low on a long drain.
It would contain moly in it for sure! Just the right amount too, and it would be the non corrosive type of moly (disulphide).
My perfect oil would be a 10w30 but would have a pour point of -70F (like those old Amsoil 10w30s used to have!) and a flash point of 500F. It wouldn't be a thin 10w30 either, but would have a viscosity of around 11 to 12 cst at 100c. Because it would have that superior base oil I want, it wouldn't drop in viscosity either.
I don't think this oil is possible though, because in addition to all this, I'd like it to cost less than $5 (US dollars) per quart.