Oil is supposed to be a rare commodity, much like it is in the real world. It is completely unnecessary for the endgame in Buildcraft, and Forestry already adds Biofuel as a renewable alternative that's almost as powerful as Oil/Fuel, AND it adds Biomass as a less powerful alternative that requires less infrastructure. Add Oil Mystcraft pages? Biofuel is useless. Biomass is useless. The way you get Mystcraft pages now, you just keep creating random ages and raiding the Abandoned Libraries found within, until you get the Oil page, and bam, done.
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It's already one of the most powerful mods available, it doesn't need anything else added to it in addition to that.
yes, you are right, when it comes to getting oil as a renewable resource with bees.
but if you just set up a 36 HP boiler, a destillery (to turn oil into fuel) and a oil fabricator (to make oil out of buildcraft energy) and a bunch of steam engines, you can just produce oil.
one bucket of oil costs 600k MJ + 10kMJ to turn it into fuel. one bucket of fuel gives ~870k MJ (not sure about the value). that is a factor of 1.39 (sure about that value). leaving you with a system that just works and generates oil, after it's started with 100 or so buckets of fuel.
no hours of breeding bees spent...
additionally, a nuclear reactor with a good setup, that generates 150 million EU per cycle (actually, with gregtech, that isn't really good, there are better setups), one 14 hour rund with thorium generates 1000 buckets of oil (the oil fabricator can be fuelled with IC2-energy aswell).
even after a balance nerf for the oil fabricator, the nuclear way would still supply you with more oil than you can possibly use.
so, let's see what happens.
by the way: if you are capable of setting up a fusion reactor, there is another mystcraft page, that matters: the one that turns the regular layer of dirt into endstone. macerater/pulverize/grind endstone to endstone dust, centrifuge it, and suddenly, you get helium, ultimatively turning an end-like world into something that is way more powerful than a ocean full of oil....