"Oils ain't Oils" - old motor oil company slogan from the 1980s.

What the US exports isn't "car ready" - most primary oil sources are heavily biased one way or the other (heavy, sweet, light, etc) and the useful end product is blended.

It's not straightforward for the US to get high on it's own supply and even what it delivers to others is less useful to thse others when other non-US sources aren't readily available to blend in.

Also ... using sequestered carbon has been increasing the insulation factor of our common atmosphere, left unchecked (ie. stopping the use of fossil fuels) is a major problem for the coming century.