Saudi Arabia will only freeze its oil output if Iran and other major producers do so, the kingdoms deputy crown prince said, challenging the countrys main regional rival to take an active role in stabilizing the over-supplied global crude market.

http://www.bloomberg.com/news/articles/2016-04-01/saudi-arabia-will-only-freeze-oil-production-if-iran-joins-plan

Over producing and dumping oil on the markets was something that Saudi Arabia started to try to kill the US shale oil producers. It has backfired on them badly and now they want their traditional enemy, Iran, to freeze its output that is still ramping up and earning lots of money for Iran.

Good luck with that plan but SA, don't hold your breath too long waiting.