Grashopa showed me in a recent forum game how easy it is to Oracle Civil Service, given the right circumstances. You pretty much need double gems or gold in your starting BFC. Don't build any settlers, as new cities slow your tech rate. Tech Writing and build a Library. Bulb Mathematics (Philosophical helps a lot here), tech CoL as you build the Oracle, and there you go, Bureacracy in 1600BC on Immortal. I've done it on a few maps.
There are countless problems however, not least that you need an outrageously good start. You will also be so far behind the AIs in cities and units at this point that the game might be out of reach. Sure, you can pump out settlers with your bureau cap at great speed, but the risks have to be carefully weighed. You can't do this if Shaka is ten tiles away. You also can't do it if Charlemagne is next door as he'll have about eight cities by the time you get your second, and there will be no land left for you.
Personally I almost never build the Oracle, but there are some funky tricks you can pull with it.