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How much gas to diesel ratio will harm a engine?

Mixing diesel and gasoline in a diesel engine is generally not recommended and can have several adverse effects on the engine's performance and lifespan:

1. Reduced Lubricity: Diesel fuel has higher lubricity compared to gasoline. When gasoline is mixed with diesel, it dilutes the lubricating properties of the fuel, which can lead to increased wear and tear on the engine's components, such as the fuel injection system and cylinder walls.

2. Incomplete Combustion: Gasoline has a lower flash point and different combustion characteristics compared to diesel. When mixed, the fuel mixture may not ignite or burn properly, resulting in incomplete combustion. This can lead to the accumulation of unburned fuel and soot inside the engine, causing performance issues and increased emissions.

3. Engine Knocking: The different combustion characteristics of diesel and gasoline can also cause knocking or pinging noises in the engine. This occurs due to pre-ignition or uncontrolled combustion, putting unnecessary stress on the engine components and potentially leading to damage.

4. Fuel System Damage: Gasoline contains additives that are not compatible with diesel fuel systems. These additives can harm fuel injection pumps, injectors, and other fuel system components, leading to costly repairs.

5. Reduced Engine Life: The combination of reduced lubricity, incomplete combustion, engine knocking, and fuel system damage can significantly shorten the lifespan of the engine.

It's important to note that the specific consequences of mixing gasoline with diesel will depend on various factors, such as the percentage of gasoline in the mixture, the type of diesel engine, and the engine's condition. However, it's generally advisable to avoid mixing diesel and gasoline and use pure diesel fuel to ensure the proper functioning and longevity of the engine.