Tehran: Iran's caretaker oil minister said on Saturday that OPEC was opposed to any increase in output ceilings in the absence of "well-studied justifications".

"Iran's policy as head of OPEC is to maintain the production ceiling of this organisation," Mohammad Aliabadi was quoted as saying by the semi-official Mehr news agency.

"It is an issue which a majority of OPEC members agree with."

Iran holds the rotating OPEC presidency.