Mercedes Mullins
Oil is an essential component of modern vehicles, with many uses beyond serving as a fuel source. In its purest form, oil functions as a lubricant in engines, ensuring the smooth movement of components while minimising friction and wear. This lubrication system, akin to the blood in our bodies, consists of a sump, oil galleries, an oil pump, and a filter to remove impurities. While petrol and diesel are by-products of oil, its primary role in engines is to provide lubrication and protection. Additionally, oil is converted into various fuels, including gasoline, diesel, kerosene jet fuel, and heating oil, powering different types of vehicles and machinery. Vegetable oils, such as rapeseed oil and coconut oil, can also be used as biofuels with certain modifications, offering an alternative to conventional fossil-based fuels.
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What You'll Learn
- Crude oil is refined into petroleum products like petrol and diesel
- Oil functions as a lubricant to reduce friction and component wear
- Oil viscosity impacts engine performance and efficiency
- Vegetable oil can be used as a fuel with certain modifications
- Biofuels are used as petroleum products, mixed with gasoline and diesel fuel
Crude oil is refined into petroleum products like petrol and diesel
Crude oil is a fossil fuel that is refined into petroleum products like petrol and diesel. Petroleum refineries convert crude oil into these products through a process called refining. This process breaks down the crude oil into its various components, which are then selectively reconfigured into new products. All refineries have three basic steps: first, the crude oil is heated in a furnace until it vaporizes into a gas. The liquids and vapours are then piped into distillation units, where they separate into petroleum components, called fractions, according to their boiling points. Heavy fractions are collected at the bottom, and light fractions are collected at the top.
The heaviest streams are processed in coking units, which apply high amounts of heat and pressure to break down their molecules into smaller molecules, resulting in petroleum coke as a byproduct. Products from this process include butanes, naphtha, diesel, and petroleum coke. Diesel fuel is used in diesel engines, which are found in heavy construction equipment, trucks, buses, tractors, boats, trains, some automobiles, and electricity generators.
Gasoline, also known as petrol, accounts for the largest share of total petroleum products produced each year in U.S. petroleum refineries. Refinery technicians carefully blend various streams from the processing units to make gasoline, taking into account octane level, vapour pressure ratings, and other considerations.
In addition to gasoline and diesel, refineries can also produce jet fuel, kerosene, heating oil, and asphalt from crude oil. The specific petroleum products that can be derived from crude oil depend on its physical characteristics, particularly its density (API gravity) and sulfur content. Less dense (lighter) crude oils with higher API gravity generally yield more light hydrocarbons, which can be converted into high-value products through simple distillation. On the other hand, heavier crude oils with lower API gravity require additional processing to produce high-value products.
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Oil functions as a lubricant to reduce friction and component wear
Lubrication is a critical aspect of maintaining and enhancing the performance of machines, particularly in the automotive industry. Oil functions as a lubricant to reduce friction and component wear in several ways.
Firstly, oil acts as a protective layer between two solid surfaces in mutual contact. By forming an oily liquid film, oil prevents direct metal-to-metal contact, reducing friction and allowing the components to slide smoothly past each other. This film or layer of oil fills in any irregularities on the surfaces, further reducing resistance and ensuring smooth operation.
Secondly, the choice of oil or lubricant is crucial. The correct viscosity of the oil is essential to ensure it can effectively flow into tight spaces and create an "oil wedge" beneath moving parts, such as shafts. This oil wedge separates the surfaces, preventing any contact and, consequently, reducing friction and wear. Additives in the oil also play a vital role in wear protection, bonding to the metal surfaces and forming a sacrificial layer.
Additionally, oil serves to control temperature by carrying heat away from moving parts, preventing excess heat build-up, and reducing the warmth generated by friction. This temperature control helps maintain optimal operating conditions and prevents overheating.
Proper lubrication also helps eliminate harmful particles, prevents contamination, and reduces the ingress of contaminants into critical areas, further reducing wear and extending the life of the machinery.
In the context of automotive engines, motor oil is specifically designed for lubrication to reduce friction and wear on internal moving parts. It also has the important function of cleaning the engine by removing sludge and varnish and neutralizing acids that can cause corrosion and damage.
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Oil viscosity impacts engine performance and efficiency
Oil viscosity is a crucial factor in the performance and longevity of a car's engine. It refers to the thickness of the oil or how freely it flows at different temperatures. Viscosity measures an oil's resistance to flow, which influences lubrication and heat management.
Low-viscosity oils are thinner and flow more easily, reducing resistance and allowing the engine to operate more smoothly. They also dissipate heat effectively, reducing the risk of overheating. This is particularly beneficial during high-speed or long-distance driving. However, oils that are too thin may not provide adequate lubrication under extreme conditions, leading to increased wear and tear on engine components.
On the other hand, high-viscosity oils are thicker and offer better protection under heavy loads and high temperatures. They create a thicker protective layer over engine components, reducing friction and enhancing engine longevity. However, if the oil is too thick, it can restrict circulation, diminish lubrication, and cause overheating. It may also reduce fuel efficiency and put unnecessary strain on the engine's oil pump.
The ideal oil viscosity depends on various factors, including engine type, operating conditions, and climate. Colder climates typically require lower viscosity oils, as they flow more easily at low temperatures. Conversely, high-performance scenarios, such as long trips, heavy towing, or racing, may require high-viscosity oils to withstand increased heat.
To ensure optimal engine performance and longevity, it is essential to select the correct oil viscosity for your vehicle and maintain proper oil maintenance. Regular oil changes and the use of high-quality synthetic oils can help mitigate the effects of contamination and extend the lifespan of the engine.
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Vegetable oil can be used as a fuel with certain modifications
The use of vegetable oil as an alternative fuel for cars has been an area of interest since the 1930s and 1940s, with the most significant scientific interest occurring in the 1970s and early 1980s. This was due to the energy and fuel crises at the time, as well as concerns over the world's non-renewable resources being depleted. Vegetable oil, also known as straight vegetable oil (SVO) or pure plant oil (PPO), can be used as fuel in diesel engines and heating oil burners.
Most diesel car engines can use SVO/PPO with certain modifications. The viscosity and surface tension of the oil must be reduced by preheating it, as highly viscous oils can cause issues with atomization, leading to incomplete combustion and carbonization. Preheating can be achieved by using waste heat from the engine or electricity. In colder climates, it is often necessary to heat the fuel lines and tank to prevent the oil from solidifying. One method to achieve this is by adding a heat exchanger and an additional fuel tank for a petrodiesel or biodiesel blend, switching between the two tanks based on the engine's temperature.
Cosolvent blending is another method to reduce viscosity by diluting the vegetable oil with a low-molecular-weight solvent, such as diesel fuel, kerosene, or gasoline. However, this method has been associated with higher rates of wear and failure in fuel pumps and piston rings. Biodiesel, produced by transforming raw vegetable oils through transesterification, can also be used as an alternative. Biodiesel has similar physical properties to conventional diesel and can be used alone or mixed with fossil diesel without major modifications, providing similar engine performance and durability.
Vegetable oil can also be blended with conventional diesel or processed into HVO or bioliquids for use under a wider range of conditions. With minimal modifications, residential furnaces and boilers designed to burn No. 2 heating oil can utilize biodiesel or filtered, preheated waste vegetable oil (WVO). New standard oil burners are certified to operate on B-20 biodiesel, and higher blends are possible with careful consideration of potential clogging issues.
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Biofuels are used as petroleum products, mixed with gasoline and diesel fuel
Biofuels are an alternative to traditional fossil fuels, which are derived from plant material or other feedstocks that are renewable. They have been around longer than cars but have been kept on the fringe due to the availability of cheap gasoline and diesel. However, with spikes in oil prices and global efforts to mitigate climate change, biofuels are being increasingly considered as a viable option.
Biofuels are used as petroleum products, mostly mixed with gasoline and diesel fuel. In 2022, the US consumed about 1.17 million barrels per day of biofuels, including fuel ethanol and biodiesel, renewable diesel, and other biofuels. Ethanol, an alcohol fuel, is blended with petroleum gasoline for vehicles and accounted for the largest share of US biofuel production (82%) and consumption (75%) in 2022. It is made by fermenting the sugars from plants such as corn or sugarcane, and it contains oxygen that helps a car's engine burn fuel more efficiently, reducing air pollution. In the US, the most common blend of ethanol is E10 (10% ethanol, 90% gasoline), while in Brazil, the second-largest ethanol producer, fuel can contain up to 27% ethanol.
Biodiesel, on the other hand, is a biofuel usually blended with petroleum diesel and accounted for the second-largest share of US biofuel production and consumption in 2022. It is derived from fats such as vegetable oil, animal fat, and recycled cooking grease. Some buses, trucks, and military vehicles in the US run on fuel blends with up to 20% biodiesel. Renewable diesel, chemically similar to petroleum diesel, is considered a "drop-in" fuel that does not need to be blended with conventional diesel. It can be derived from fats or plant-based waste and is used as a replacement for petroleum-based diesel fuel.
Biofuels are also used in the aviation and shipping industries, although their adoption is far below the 2030 targets set by the International Energy Agency. Additionally, the production and use of biofuels may be eligible for government programs that promote or require their use, and they can be used for heating and electricity generation.
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Frequently asked questions
Oil is often referred to as the "lifeblood" of an engine. While petrol and diesel are by-products of oil, oil in its purest form functions as a lubricant. Oil is stored in the sump and pumped through the engine under pressure, leaving a lubricating film that creates a slippery surface, ensuring the engine's components move smoothly while minimising friction.
Oil is consumed through contamination, which is caused by droplets of fuel leaking past the piston rings and landing in the engine's sump. This leads to internal component wear, producing microscopic particles and engine heat. These particles float in the oil until they are caught by the filter, which becomes less effective over time.
Crude oil is refined into petroleum products such as petrol and diesel, which are used to fuel cars. Vegetable oil, specifically straight vegetable oil (SVO) or pure plant oil (PPO), can also be used as fuel with certain modifications to the engine.
