Diesel is the light fraction of oil distillation — the part of crude that boils off first — and the target product of the Distillation Column in the Ala Industrial mod. One run splits 1 000 mB of crude Oil into 700 mB of Diesel plus 200 mB of Fuel Oil for 400 EU, so seven tenths of every barrel leave the tower as golden-yellow fuel. Diesel never generates in the world: the column is its only source. Unlike Oil, the fluid behaves exactly like water — it spreads, never catches fire, does not slow movement and does not drown the player.

Diesel is collected with an empty bucket, a capsule, or a Pump set against the yellow nozzle on the tower's top segment, which guards a 10 000 mB extract-only tank. Mounting the Rectification Section on top of the column raises the yield to 750 mB per run, and surplus Fuel Oil poured back into the input tank cracks into another 600 mB of Diesel per 1 000 mB. The fluid is not renewable: two placed sources never spawn a third, so the supply tracks the Oil in the ground. Diesel already carries the c:combustion_fuels tag shared with Fuel Oil and lava, and the planned liquid fuel generator will burn it at 12 EU/t — 12 000 EU from a single bucket.