From what I've read most oil-producing countries are already near peak production. Saudi Arabia still has some room, but what good is more pumping if they can't get the oil out of there. Iran would most certainly block all shipping in the Gulf if war broke out.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL