Difference between diesel and fuel oil?

Diesel and fuel oil are both refined petroleum products used as energy sources, but they differ in composition, application, and performance characteristics. Diesel fuel, also known as Automotive Diesel Oil (ADO), is a lighter fraction obtained during crude oil refining. It has a lower viscosity and a higher volatility, allowing it to ignite easily under compression. Diesel is primarily used in internal combustion engines found in vehicles, generators, and industrial equipment. It burns cleanly and efficiently, producing high energy output with relatively low emissions when compared to heavier fuels.

Fuel oil, on the other hand, generally refers to heavier fractions of crude oil such as Marine Fuel Oil (MFO) or Heavy Fuel Oil (HFO). It is more viscous and requires preheating before use. Fuel oils are typically used in ships, large industrial boilers, and power plants where high heat energy is required. These fuels are less refined, contain more impurities, and produce higher levels of sulfur and particulate emissions.

In summary, diesel is a cleaner, lighter, and more efficient fuel designed for smaller engines and mobile applications, while fuel oil is heavier, cheaper, and better suited for large-scale stationary or marine operations.

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