Diesel fuels are broken up into 3 different classes: 1D, 2D and 4D. The difference between these classes depends on viscosity (the property of a fluid that causes a resistance to the fluid’s flow) and pour point (the temperature at which a fluid will flow).
4D fuels tend to be used in low-speed engines. 2D fuels are used in warmer weather and are sometimes mixed with 1D fuel to create a competent winter fuel. 1D fuel is preferred for cold weather as it has a lower viscosity.
Synthetic diesel comes from several sources such as wood, straw, corn and even garbage or discarded foods.
Biodiesel is an ecologically-friendly type of diesel. It is a cleaner-burning diesel made from natural, renewable sources such as vegetable oils and animal fats. Biodiesel is helping to reduce American dependence on foreign petroleum. It is also helping in the creation of green jobs and the improvement of our environment.