[SeeSharp]

...cartels don't normally last as long as OPEC had by then (it was formed around 1960 I think)

OPEC was formed in the 1950's. It's purpose was to break the Anglo-American cartel known as the Seven Sisters. It was completely successful in that endeavor. Afterwards, it suffered the same problems all cartels suffer, mainly internal cheating. For instance, during the oil embargo the Iraqi oil minister, Saddam Hussein, made an under the table deal to sell oil to the US.

[TnTnTn]

Oh.......more winning.....: