Just trying to answer the thread's question, "why its not common now?".

I agree, if it will convert clean.

I still want to know how you knew Manifa had high V content?  I can't find anything more other than API and S%.

I heard that a long time ago, from this article:

http://www.geocities.com/davidmdelaney/after-oil-david-fleming.html

Thank you Leanan.  Just went in the Saudi DB.