The Diesel engine is a game engine developed and used by GRIN. The engine was originally developed for their game Ballistics and has been used, albeit with modifications, in a number of other games since then. The first installment of the engine was developed in close collaboration with NVIDIA, aimed to showcase the capabilities of their latest graphics chip at the time, the GeForce 3. The engine is currently in use by Overkill Software, formerly the owners of the now defunct developer, GRIN. Overkill's game, Payday: The Heist, uses a modified version of this engine. Payday 2 uses the second generation Diesel engine 2.0.