In the producing phase what goes differently for diesel and petrol considering that both are produced from crude oil?
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It’s not that oil is *turned into* one or the other. Raw oil is like a box full of all sorts of rocks, some are tiny sand, some are pea-gravel, some are fist sized chunks of stone.
The producing process filters the rocks by size, the tiny sand would be things like methane, butane, propane; the pea-gravel is a mix of medium sized rocks which we call “petrol” but is mostly a similar sized rock called “octane”. Diesel fuel would be everything bigger than pea-gravel up to the fist sized rocks. If you had a few random massive rocks in the given box, those would be “fuel oil” or “bunker fuel” or even set aside as engine oil (lubricant) vs. a fuel source.
So the single box of “oil” gets broken down into the sub groups, so 1 box of oil might be 1/3 sand, 1/2 pea-gravel, and the remainder is fist sized.
The point being petrol and diesel are themselves composites, not a single sized ‘rock’, that are filtered down out of the larger mixture.
The ratio of petrol to diesel you get out of a single ‘box’ might vary by oil source.
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