Does used french fry oil work for a diesel substitute?

While used french fry oil can technically be used as a substitute for diesel fuel in some diesel engines, it is important to note that this is not a widely recommended practice and there are several drawbacks associated with using it:

Fuel Efficiency: Used french fry oil has a lower energy density compared to diesel fuel, which means that a greater volume of oil would be required to achieve the same power output. This can result in reduced fuel efficiency.

Engine Performance: Using used french fry oil as a diesel substitute may lead to reduced engine performance and power output. The oil's higher viscosity can cause injector clogging, reduced fuel atomization, and incomplete combustion, resulting in lower engine efficiency and increased emissions.

Emissions: Burning used french fry oil produces higher emissions compared to diesel fuel. These emissions include particulate matter (soot), hydrocarbons, and carbon monoxide, which contribute to air pollution and have negative environmental impacts.

Engine Wear and Tear: Using used french fry oil can cause premature wear and tear of engine components. The oil's contaminants and higher viscosity can lead to increased deposits on injectors, piston rings, and cylinder walls, leading to reduced engine lifespan.

Lack of Lubricity: Used french fry oil lacks the lubricating properties of diesel fuel, which can result in increased friction and wear on fuel pump components and injectors.

Legal Concerns: In some jurisdictions, using alternative fuels like used french fry oil may be subject to regulations or restrictions. It is essential to check the local laws and regulations before using any alternative fuels in diesel engines.

Overall, while used french fry oil can be used as a diesel substitute in some engines, it is not recommended as it can lead to reduced performance, higher emissions, increased engine wear, and potential legal issues. It is always recommended to use the fuel specified by the engine manufacturer to ensure optimal performance and longevity of the engine.