Olium is a gas which is formed when you mix SO3 with 98% H2SO4. It's chemical name is Pyrosulphuric Acid.
Petrol is originated from to Latin words: Petra + Olium Petra = rocks Olium = Oil
"Sulphan" does not appear to be a recognized term. It may be a misspelling or abbreviation for "sulfan," a prefix commonly used in chemistry to denote compounds containing sulfur. Can you provide more context or clarify?