What Is the Diesel 3.0 Engine Upgrade?
The payday 2 diesel 3.0 engine upgrade is a major update to PAYDAY 2's underlying game engine. The original Diesel engine (also used in PAYDAY: The Heist, Left 4 Dead, and Counter-Strike: Global Offensive) was a 32-bit engine with significant limitations. The Diesel 3.0 update modernizes the engine, bringing it to 64-bit architecture and improving performance, stability, and modding capabilities. With this update, payday 2 diesel 3.0 mods require the 64-bit version of Super BLT and updated BeardLib.
PAYDAY 2 was originally released in 2013 on a 32-bit engine. This limited the game to 4GB of RAM, caused frequent crashes with many mods, and limited resolution options. The Diesel 3.0 upgrade removes these limitations, making the game more stable and future-proof.
Key Changes at a Glance
| Feature | Before (Diesel 2.x) | After (Diesel 3.0) |
|---|---|---|
| Architecture | 32-bit | 64-bit |
| RAM Limit | ~4GB (capped by 32-bit) | Unlimited (system RAM) |
| Mod Stability | Frequent crashes with 50+ mods | Much more stable |
| Resolution Support | Limited, issues on modern displays | Full ultrawide, 4K, high refresh rate |
| Performance | CPU bottlenecked, stutter | Better multi-core utilization |
| Mod Loader | BLT (32-bit) | Super BLT 64-bit |
64-bit Support (SuperBLT 64 bit)
The most significant change in Diesel 3.0 is the move to 64-bit architecture. This means the game can now access more than 4GB of RAM, which is critical for modded playthroughs.
What 64-bit Means for You
- No more RAM crashes: The 32-bit version would crash when hitting the 4GB memory limit, especially with many mods or custom heists. 64-bit eliminates this.
- More mods simultaneously: You can run more mods at once without memory-related crashes.
- Larger custom heists: Modders can create larger, more detailed custom maps without memory constraints.
- Better texture quality: High-resolution texture packs work without memory issues.
SuperBLT 64 bit
With the move to 64-bit, you need the superblt 64 bit version of the mod loader. The old 32-bit Super BLT will not work with the Diesel 3.0 engine.
If you're upgrading from the old 32-bit version, you MUST download and install the 64-bit version of Super BLT. The old 32-bit version will fail to inject or cause crashes. Visit the official Super BLT website and download the latest 64-bit version. See our mods guide for detailed installation instructions.
How to Verify You're on 64-bit
- Launch PAYDAY 2
- Open Task Manager (Ctrl+Shift+Esc)
- Find PAYDAY 2 in the process list
- If it says "PAYDAY 2 (32 bit)" — you're on the old version
- If it says just "PAYDAY 2" — you're on 64-bit (Diesel 3.0)
Performance Improvements
The Diesel 3.0 engine upgrade brings noticeable performance improvements, especially on modern hardware.
Expected Performance Gains
| Hardware Tier | Expected Improvement | Notes |
|---|---|---|
| High-end (RTX 30+ / Ryzen 5000+) | +20-40% FPS | Biggest gains from multi-core utilization and 64-bit |
| Mid-range (GTX 1660 / i5 8th gen) | +10-25% FPS | Stability improvements most noticeable |
| Low-end (older hardware) | +5-15% FPS | May need to lower settings for best experience |
Specific Improvements
- Better multi-core CPU utilization: The old engine was heavily single-threaded. Diesel 3.0 distributes load better across multiple CPU cores.
- Reduced stutter: Asset streaming is improved, reducing hitches when moving between areas.
- Faster load times: 64-bit architecture and improved I/O reduce heist load times.
- Higher FPS caps: The engine now supports higher refresh rates (144Hz+) without frame pacing issues.
- Better VR performance: PAYDAY 2 VR benefits significantly from 64-bit and improved rendering.
For best performance: Set Texture Quality to High (now possible with 64-bit), Shadow Quality to Medium, turn off Motion Blur, and set Max FPS to your monitor's refresh rate. The new engine handles high texture settings much better than the old 32-bit version.
Resolution Fix
Many players experienced payday 2 resolution fix issues after the engine update — incorrect resolution, black bars, stretched image, or inability to select native resolution. Here's how to fix common resolution problems.
Common Resolution Issues & Fixes
| Issue | Cause | Fix |
|---|---|---|
| Game stuck at low resolution | Old config file from 32-bit version | Delete renderer_settings.xml in %LOCALAPPDATA%\PAYDAY 2\ and let the game regenerate it |
| Black bars on ultrawide | Aspect ratio not detected correctly | Set resolution manually in game settings, or edit renderer_settings.xml to your native resolution |
| Stretched image | Wrong aspect ratio setting | Set Aspect Ratio to "Auto" or match your monitor (16:9, 21:9, etc.) |
| Can't select 4K resolution | Display scaling in Windows | Disable display scaling for PAYDAY2.exe in Compatibility settings |
| Resolution resets on launch | Config file read-only or corrupted | Delete config files, verify game cache via Steam, set resolution again |
| Borderless window not working | Graphics driver issue | Update GPU drivers, try switching between Fullscreen and Borderless |
Manual Resolution Configuration
If the in-game settings don't work, you can manually edit the renderer settings file:
- Navigate to
%LOCALAPPDATA%\PAYDAY 2\ - Open
renderer_settings.xmlwith a text editor - Find the
<resolution>tag - Set width and height to your native resolution (e.g., 2560x1440, 3440x1440, 3840x2160)
- Save the file and set it to Read-only to prevent the game from overwriting it
Always back up your renderer_settings.xml before making changes. If the game fails to launch after editing, delete the file and let the game regenerate a default configuration. Never edit the file while the game is running.
Ultrawide Support
Diesel 3.0 adds proper ultrawide monitor support (21:9, 32:9). The game now correctly renders at ultrawide resolutions without stretching or black bars. For the best ultrawide experience:
- Set resolution to your native ultrawide resolution (e.g., 3440x1440)
- Set Aspect Ratio to Auto
- Use Borderless Fullscreen for best results
- Some HUD elements may need adjustment via mods like VoidUI or WolfHUD
Mod Compatibility
The Diesel 3.0 engine upgrade affects mod compatibility. Most mods work, but some need updates, and the mod loader must be the 64-bit version.
Mod Compatibility Status
| Mod Type | Compatibility | Action Required |
|---|---|---|
| HUD mods (WolfHUD, VoidUI) | ✅ Fully compatible | Update to latest version |
| Quality of Life mods | ✅ Mostly compatible | Check for updates, some may need patches |
| BeardLib / Custom heists | ✅ Compatible with 64-bit BeardLib | Update BeardLib to 64-bit version |
| Mod Overrides (textures/models) | ✅ Fully compatible | No action needed |
| Old BLT mods (32-bit) | ⚠️ May need updates | Check mod page for 64-bit patch |
| Cheat / DLC unlocker mods | ❌ Not recommended | Avoid — can cause bans/cheater tags |
Steps to Update Your Mod Setup for Diesel 3.0
- Back up your mods folder — copy the entire
mods/directory to a safe location - Remove old Super BLT — uninstall the 32-bit version completely
- Install Super BLT 64-bit — download from the official site and run the injector
- Update BeardLib — download the latest 64-bit compatible version
- Update all mods — use the in-game mod updater or manually download latest versions
- Test one mod at a time — if you experience crashes, enable mods one by one to find incompatible ones
If your game crashes after the Diesel 3.0 update: 1) Make sure you're using Super BLT 64-bit, not 32-bit. 2) Update all mods to their latest versions. 3) Remove outdated mods that haven't been updated in years. 4) Check the crash log in mods/logs/ for specific error messages. 5) Verify game files via Steam if issues persist.