Oil Refinery
The Oil Refinery turns oil into fuel. Oil is pumped in through Buildcraft Waterproof Pipes or alternatively by filling up with buckets of oil. To set the refinery up, you will need multiple tanks, either steam engines or combustion engines (or, alternatively, an energy link), a lot of waterproof pipes and a wooden waterproof pipe on the output.
If you’re using combustion engines, you will need to be wary as they can explode so you must cool them, further increasing the number of pipes you will use in a setup. 2 engines are enough to power the refinery to produce a bucket of fuel every 57 seconds and, it can, power the combustion engines itself in an efficient setup.
Oil Refinery Recipe
To make the Oil Refinery, you simply just need three tanks in a triangle shape surrounding a diamond gear then two redstone torches on the two sides next to the top tank.

Energy Link Video