Refineries in Nigeria were build in den days military administrators, these refineries were situated in Kaduna, Delta, and Rivers state respectively,. They operated with out interruption for decades during the military regimes now they are all dilapidated and are begging for resuscitation.
That resuscitation might never come, the oil marketers we mostly refer to as the cabals will never allow it to work, because since the refineries are not working, it allows them to import refine products and sell it at any given price they want. Even the refinery Dangote has tried his best to build, so that we can be refining locally, they've all ganged to to fight him, so a point the man is now ready to sell it out to the federal government of Nigeria. As at to the price of premium motor spirit PMS is sold in some filling station for 850 naira, black market is 1000 naira.