Fuel Oil is the heavy bottom fraction of oil distillation in the Ala Industrial mod for Minecraft 26.2. Every bucket of Oil processed by the Distillation Column splits into 700 mB of Diesel and 200 mB of Fuel Oil, and the thick dark-brown residue runs down into the column's bottom tank, which holds 10,000 mB. In the world Fuel Oil spreads like a fluid but sinks like something thicker than water — falling in deals no damage and never drowns you, but you sink at roughly 6.8 blocks per second and climb back out by holding jump at about 1.7 blocks per second, with a dark-brown tint filling the screen while submerged. It never catches fire — scoop it up with an empty bucket, a Vacuum Capsule, or a third Pump at the tower's base. Fuel Oil never generates naturally and cannot be crafted, so the Distillation Column is its only source.

The residue is cheap fuel by design. Fuel Oil holds 6,000 EU per bucket at 6 EU/t — half of Diesel from the same distillation — and already carries the c:combustion_fuels tag reserved for the liquid fuel generator planned in the mod's oil branch. The working outlet today is the Distillation Column's own cracking mode: feed Fuel Oil back into its input tank, and 1,000 mB of Fuel Oil plus 400 EU returns 600 mB of Diesel, turning 6,000 EU of residue into 7,200 EU of the stronger fuel. Mind the tower's pace, too — Fuel Oil accumulates on its own while Diesel distills, and once the 10,000 mB bottom tank fills, the whole column pauses until the residue is drained.