Changelog

Version: 2.1.7
Date: 2026-08-26

  Features:
    - Added a second alternative recipe for Engine Units which uses Lubricant that becomes available alongside the Light Oil variant when using the Refined Engine Units setting (now ON by default) 

  Changes:
    - (Space Age) Alternative recipe for Engine Units - Refined Engine Units Technology, now requires Space Sciene technology to unlock. (Previously Coal Liquefaction.) Base game version still becomes available after Advance Oil Processing.
    - (Space Age) Science pack cost updated to reflect the technology changes.
    - Light Oil variant now require 5x Light Oil instead of 10 due to production chain on Vulcanus. Lubricant variant requires 40x Lubricant due to being more abundant on Gleba.

  Other:
    - Changed some internal item names in the code

Version: 2.1.6
Date: 2026-08-22

  Features:
    - Mod now has optional setting, off by default, to use new Engine Unit (Light Oil) recipe.

  Changes:
    - (Space Age) Alternative recipe for Engine Units now requires the Coal Liquefaction technology to unlock. (This change should keep the original idea of the mod, though make it a worth while unlock when using Spage Age.)
    - (Base Game) Alternative recipe for Engine Units still requires the Advanced Oil Processing technology to unlock.
    - Engine Unit alternative recipe name changed to Refined Engine Unit with new icon to make it easier to tell the two apart.
    - Reverted the amount of Crude Oil from 20 to back to 10. (Should be slightly better, economically, to send Crude Oil in barrels than pre-made Engines Units to space.)
    - Alternative recipe for Engine Units also require 10 Light Oil. (Hopefully still making the recipe proportionally cheaper than using the standard Crude Oil recipe.)
    - Expensive mode is now triple the steel and gears, instead of double. (2 -> 3)
    - Skipped version 2.1.5 to be consistant with the 2.0 version of the game.

Version: 2.1.4
Date: 2026-08-17

  Features:
    - Added alternative recipe for Engine Units to require 20 Light Oil after Advanced Oil Processing is unlocked. This should hopefully work correctly with Space Age.

  Changes:
    - Increased the amount of crude oil from 10 to 20

Version: 2.1.3
Date: 2026-07-14

  Features:
    - Added optional dependancy for my 'Chemical Science Uses Oil' mod

  Changes:
    - When 'Chemical Science Uses Oil' is enabled, changes tech tree so chemical science no longer requires engines as a prerequisite.
    - Updated mod icon

Version: 2.1.2
Date: 2026-07-12

  Changes:
    - Added changelog.

Version: 2.1.1
Date: 2026-07-11

  Features:
    - Added toggleable start up setting for expensive mode.
    - Added toggleable start up setting tp add iron sticks to recipe.

Version: 2.1.0
Date: 2026-07-08

  Features:
    - Initial release.