Bring a Complete DEF Experience to FS25
The Diesel Exhaust Fluid System expands Farming Simulator 25’s existing native DEF functionality into a complete, usable system for properly configured diesel vehicles.
Instead of DEF remaining mostly in the background, compatible vehicles can now actively use, monitor, transport, and refill Diesel Exhaust Fluid while you work.
The mod is built around Farming Simulator 25’s native DEF fill type and consumer system, allowing supported vehicles to retain the game’s underlying DEF mechanics while adding the features needed to make DEF a meaningful part of vehicle operation.
Keep an Eye on Your DEF
Compatible diesel vehicles are automatically detected when they contain a properly configured native DEF consumer.
When operating a supported vehicle, a dedicated DEF gauge appears alongside the standard vehicle HUD, allowing you to monitor the vehicle’s DEF level while you work.
Diesel fuel and DEF remain completely independent, so refilling diesel will not automatically refill your DEF tank.
Vehicles that do not use DEF, including gasoline-powered vehicles, remain unaffected and will not receive the DEF gauge.
Functional DEF Refilling
Running low on DEF?
The system includes dedicated DEF refill support so compatible vehicles can be topped off separately from their diesel fuel.
DEF consumption continues to use the game’s native motorized consumer system, while the mod provides the additional refill and vehicle support needed to make the system practical during normal gameplay.
Included DEF Supplies
Three DEF products are included in the shop:
10 L DEF Jug — $80
A portable container ideal for small top-offs, service trucks, or emergency refills.
280 L DEF Pallet — $1,250
A larger farm-shop and fleet-service supply for keeping multiple vehicles topped off.
1,000 L DEF IBC Tote — $3,200
Bulk DEF storage for farms, equipment yards, truck garages, and larger fleets.
All three containers are fully functional and designed to work naturally within the Farming Simulator 25 environment.
DEF Transport Support
Compatible non-motorized liquid carriers that already support liquids such as water, milk, or diesel can also transport DEF.
This gives you additional options for moving larger quantities of DEF around the farm or between equipment yards.
Features
Native FS25 DEF consumer support
Automatic compatible vehicle detection
Dedicated DEF HUD gauge
Independent diesel and DEF tanks
Native DEF consumption
Separate DEF refilling
10 L DEF Jug
280 L DEF Pallet
1,000 L DEF IBC Tote
Dynamic mounting and tension-belt support where applicable
DEF transport support for compatible liquid carriers
Clean store integration
English and German localization
Optimized models and textures
Multiplayer supported
Vehicle Compatibility
Vehicles must be correctly configured with Farming Simulator 25’s native DEF fill type and DEF consumer system in order to use the vehicle-side DEF features.
A compatible diesel vehicle should contain its own DEF fill unit and native DEF consumer.
Vehicles without a DEF consumer will continue to operate normally and will not display the DEF gauge.
Because vehicle mods are created by many different authors and may use different configurations, compatibility with every third-party vehicle cannot be guaranteed.
Tested
The release build has been tested for:
DEF vehicle detection
Native DEF consumption
DEF HUD display
Independent diesel and DEF levels
DEF emptying
DEF refilling
Container interaction
Store integration
Compatible liquid-carrier support
Savegame loading
In-game operation
The final release build also passed GIANTS Farming Simulator 25 TestRunner 0.9.19 with all 14 test modules passing.
Diesel Exhaust Fluid System
Developed by JerseyShoreModding
Keep your fleet fueled.
Keep your DEF topped off.
And keep the equipment moving.
V1.1.0.0
New
Added a 5,000 L Bulk DEF Tank
Stores native DEF
Can be refilled from compatible liquid carriers
Dispenses DEF directly to compatible vehicles and trailers
Includes dedicated store artwork and placeable collisions
Added a Diesel & DEF Combo Tank
25,000 L Diesel capacity
5,000 L DEF capacity
Separate internal storage for Diesel and DEF
Shared bulk unloading point
Selectable Diesel or DEF vehicle refill
Dedicated store artwork and placeable collisions
Improvements
Universal DEF support for compatible non-motorized liquid carriers
Compatible trailers supporting Water, Milk, or Diesel can also carry DEF
Improved DEF refill and loading-station behavior
Updated refill localization
Cleaned and optimized placeable I3D mappings
Improved collision setup for the new bulk tanks
Added proper store-image mipmaps
Optimized tank textures and removed duplicate assets
Updated texture compression where appropriate
Improved clip-distance settings on the new placeable models
Updated modDesc and version history for current FS25 requirements
Existing DEF Equipment
The following equipment remains included:
10 L DEF Jug
280 L DEF Pallet
1,000 L DEF IBC Tote
Compatibility
Uses Farming Simulator 25’s native DEF fill type and vehicle consumption system
Diesel and DEF remain completely independent
Existing DEF vehicle HUD and consumption functionality remain unchanged
