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That cannot possibly be true. Up until very recently US oil was barred from being exported.

That's patently untrue. Saudi crude is primarily heavy or medium and sour (high in sulfur), the complete opposite of what you're saying.

You are rather misinformed.

For instance,the Exxon refinery in Baytown can refine darn near anything.

The EIA has a page to track it and he different types of crude oil here: https://www.eia.gov/opendata/qb.php?category=1292755

I recall this being the other way:

We can refine anything, but other places can not, so they pay more than we would for the nicer oil. We used to mainly get oil from Venezuela, which is extremely sour. Saudi Arabia affects our prices due to the world market, but we have never gotten much oil from there because of the long shipping distance.