Difference Between Diesel and Bio-Diesel

What is Diesel?

Diesel is a type of fuel that is derived from crude oil. It is a fractional distillate of petroleum fuel and is composed of various hydrocarbons. Diesel contains no additives or aromatics, making it a relatively clean-burning fuel.

 Diesel engines are more efficient because they use compression to ignite the fuel instead of spark plugs; diesel engines can produce more power with less fuel resulting in lower emissions and increased fuel economy.

Diesel engines are used in several applications, including automotive, trucks, buses, marine vessels, construction machinery, agricultural equipment, and locomotives.

Diesel fuel is also used to power many generators and other equipment. Diesel fuel is composed of hydrocarbons that are more resistant to oxidation and are less volatile, making it an ideal fuel choice for vehicles that operate in extreme conditions, such as cold weather or dusty environments.

Diesel engines require more maintenance, requiring regular oil and fuel filter changes. In addition, diesel engines can be prone to black smoke caused by incomplete combustion of the fuel.

What is Bio-Diesel?

Bio-diesel is a renewable fuel made from vegetable oils, animal fats, and other types of fats and oils. It is a substitute fuel that works with diesel engines and can help reduce emissions of greenhouse gases when compared to traditional diesel fuels.

Bio-diesel is a safe, clean-burning fuel produced from renewable resources, making it a sustainable energy source. Making bio-diesel involves reacting fat or oil with an alcohol, such as methanol or ethanol, and a catalyst, such as sodium hydroxide or potassium hydroxide. This reaction results in the formation of glycerine and methyl esters, the main components of bio-diesel.

Bio-diesel is becoming increasingly popular due to its environmental benefits. It is a non-toxic, biodegradable fuel that produces fewer nitrogen oxides, hydrocarbons, and particulate matter emissions than traditional diesel fuel.

It is also less volatile and less likely to evaporate and cause air pollution. Additionally, biodiesel is a renewable fuel source, meaning it can be produced in an environmentally-friendly way without depleting natural resources.

Bio-diesel can be used in most diesel engines with minimal modifications. However, it is essential to note that not all bio-diesel fuels are created equal, and it is vital to choose a fuel that meets the standards of the engine manufacturer. Additionally, since bio-diesel is derived from vegetable oils and animal fats, it is crucial to purchase and use bio-diesel that meets the standards of the National Biodiesel Board.

Bio-diesel is an increasingly common fuel choice that can lower greenhouse gas emissions and offer a renewable energy source.

Difference Between Diesel and Bio-Diesel

  1. Diesel contains sulfur and other impurities, whereas biodiesel has a higher cetane rating and is sulfur-free.
  2. Diesel has a higher energy content than biodiesel, meaning it has more energy per volume than biodiesel.
  3. Diesel is not biodegradable, whereas biodiesel is biodegradable and less toxic to the environment.
  4. Diesel is less combustible than biodiesel, meaning it has a higher flash point. 
  5. Diesel can be corrosive to certain metals, whereas biodiesel is less corrosive and can be used in various engines.

Comparison Between Diesel and Bio-Diesel

Parameters of ComparisonDieselBio-Diesel
Origina by-product of crude oilderived from vegetable oil and animal fats
Combustion Temperatureslow combustion rateThe temperature of biodiesel combustion varies depending on the fuel composition
Used forversatile and used in different industriesused for transportation, cleaning up oil spills
Environmental Impactproduces harmful emissions on combustionnon-toxic and bio-degradable produces fewer air pollutants
Type of fuelFossil fuelRenewable fuel


  1. High quality biodiesel and its diesel engine application: A review – ScienceDirect
  2. Bio-diesel as an alternative fuel for diesel engines—A review – ScienceDirect