I can see the conversion starting probably by the later part of 1998 as the US attempts to recover their economy start to falter - and accelerating with the last of the nuclear strikes in 1998 probably taking out what infrastructure was left in Great Britain to get fuel from the North Sea for NATO. It also depends on how long was Ploesti knocked out - we know it was back in operation by early 2000 to get the oil the Soviets needed for their last great offensive which destroyed the 5th. There probably was still a lot of fuel and oil available well into the middle of 1998 (keep in mind just how much fuel there would be to scrounge at least at first) - and then as infrastructure repair efforts didnt achieve results in the US and the Middle East it rapidly began to dwindle as the switchover to using what was left for lubricants and to keep ships operating to bring what supplies could be produced over to Europe and Iran and Korea and Kenya.
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