Heavy Oil
Weapon oil. It takes one enchantment slot on a gun of rank 1 or higher, and a gun can hold only one copy.
- Penalty lines
- 1
- Durability per shot
- +1
- Sell value
- 325 SULF
- Raises
- Damage, Size
Card text
- Damage: +60%
- Bullet weight: ×10
- Bullet size: +50%
On a gun
Each shot costs 1 more durability while Heavy Oil is applied, on top of the base 1 per shot and 1 per other enchantment, up to 6.
The Baptismal Font removes it and the Chrismatory rerolls it into another oil; see oils explained.
In computed builds
Heavy Oil is in the highest-DPS five-oil set (aiming kept, stock spread, rank 5) of 28 guns: Blackwater, .357 Balthazar, Chat-Pardeur 98, D4RT, 1889 Mario, Arbiter 2, Duhar, Death's Toll, Impala Gravita, Flock 76, Corpsemaker, Ferryman and 16 more. Try it in the build calculator.
Oils with no penalty that also raise damage
Other oils that raise damage
Ascetic OilDamage: +30; No money drops
Big OilBullet weight: ×20; Bullet speed: -20%; Damage: +35; Bullet size: +25%
Boulder OilDamage: +20%; Bullet weight: ×10; Bullet bounces: +1
Brute OilDamage: +30; Spread: +0.7
Complicated OilDamage: +30%; Reload speed: -25%
Discharge OilDamage: +30; Chance to consume extra ammo: +30%
Disposable OilDamage: +50; Max Durability: -75%
Dum Dum OilDamage: +22%; No organs drop
Expander OilDamage: +20; No organs drop
Fidget OilDamage: +20; Reload speed: -25%
First Blood OilDamage: +30%; Spread: +1
Franciscan OilDamage: +20%; No Money drops
Guides that mention Heavy Oil
Source
- SULFUR Wiki entry for Heavy Oil (CC BY-SA 4.0), revised 2026-04-25. Values checked against the 1.0.0–1.0.6 patch notes.