What is D2 in fuel oil?

Question

Pls elaborate further as i m a layman in this field.

Answer 1

D2 is a diesel fuel. Diesel fuel is just one of a group of fuels collectively known as “distillates.” Other well-known distillates are kerosene, jet fuel and fuel oil (for home heating). Diesel fuel is the most common distillate and LS No. 2 is the most commonly used grade of diesel. Nearly all diesel sold at retail outlets is LS No. 2 diesel, which is also referred to as “Low Sulfur No. 2,” “D2,” “LS2,” “LSD” or any other combination of LS, D and No. 2. Unless otherwise specified, “diesel” to most people means LS No. 2 diesel.

Grade No. 1 fuels are very similar, but lighter or less dense than No. 2 fuels. They have lower viscosity, lower boiling points, lower flash points and typically have better cold flow properties. They are excellent for use in cold climates and in the winter. The drawback is they usually cost more and also have lower energy content, so there is a trade-off to using a No. 1 fuel — better cold flow, but higher costs.

Bus fleets also tend to use No. 1 diesel fuels because they usually have less smoke, less NVH (noise, vibration, harshness) and won’t gel as easily in the winter. This makes the bus more “rider-friendly,” especially the part about not stalling in the cold. It is also very common to “winter blend” a No. 1 diesel with a No. 2 diesel in order to get the cold flow needed without losing too much fuel economy. Typically these blends are between 10 to 30 percent No. 1 into No. 2.

The site below gives you more info.