Katerina Swanson
There are various opinions on whether adding motor oil to diesel fuel helps with lubrication. Some sources claim that adding a small amount of motor oil to diesel fuel can help lubricate the pumps and injectors, with some recommending 2-stroke oil, while others suggest vegetable oils such as canola or sunflower oil. However, others argue that adding motor oil does not improve lubrication and that modern diesel fuel already contains additives that provide lubrication. It is important to note that the type of engine and injection system may also play a role in the effectiveness of adding motor oil. While some claim that it works for older engines, others suggest that it is not necessary for modern engines with sophisticated injection systems. Ultimately, it is essential to use high-quality fuel and follow the manufacturer's recommendations for lubricants and filters to maintain the engine's performance and avoid voiding any warranties.
Characteristics and Values Table for Adding Motor Oil to Diesel Fuel
| Characteristics | Values |
|---|---|
| Lubrication | Increased lubricity of the fuel, smoothed engine |
| Cost | $3-5 per tank fill |
| Ratio | 1 oz per gallon, 1L of engine oil with ~70L diesel, 2T oil with a 70:1 ratio |
| Alternatives | Vegetable oil (canola, sunflower), biodiesel, TC-W3 oil, Marvel Mystery Oil |
| Cautions | Engine oil designed to resist burning, has non-combustible additives, may cause engine overheating |
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What You'll Learn
Vegetable oil as a lubricant
Vegetable oils have been used as lubricants for machinery and industrial applications. They are gaining attention as an eco-friendly alternative to petroleum-based lubricants due to their renewability, biodegradability, and lower toxicity. Vegetable oils have excellent lubricity, far superior to mineral oil. Their viscosity index is also very high, which means they change less with temperature.
Vegetable oils have several advantages and disadvantages when considered for industrial and machinery lubrication. One of the major disadvantages of using vegetable oils is their high pour point, which is the lowest temperature at which the oil flows. This can be addressed by winterization, adding chemical additives, or blending with other fluids. Vegetable oils also lack sufficient oxidative stability and tend to oxidize, becoming thick and polymerizing. However, chemical modification or the use of antioxidants can address this issue.
Vegetable oils are also used in bio-based esters, which have shown good lubrication properties and the potential to replace petroleum-based metalworking fluids. Research is ongoing in this area to develop more sustainable and environmentally friendly lubricants for industrial applications.
Some people have used vegetable oils, such as canola or sunflower oil, to add lubrication to diesel systems. However, opinions vary, and some sources advise against it. One user on a forum stated that they had added about 5 quarts of filtered used motor oil to 20 gallons of diesel fuel for three years without any ill results. Another user mentioned that they occasionally add a gallon of vegetable oil to their fuel tank.
It is important to note that vegetable oil is not recommended for lubricating mechanical parts as it can gum up, attract dirt and dust, and leave solid deposits. Jojoba oil is the only vegetable oil that does not gum up and can be used as a lubricant.
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2-stroke oil
The use of 2-stroke oil in diesel fuel is a controversial topic, with some people advocating for its addition to improve lubrication, while others claim it is ineffective or even harmful. Let's delve into the details and explore the various perspectives on this subject.
Firstly, it is important to understand the motivation behind adding 2-stroke oil to diesel fuel. With the introduction of low- and ultra-low-sulphur diesel (ULSD), there has been a concern that the reduction in sulphur content compromises the lubricating properties of the fuel. Sulphur has slight lubricating properties, but it is not the primary lubricating component. The process of hydrodesulfurisation (HDS) used to reduce sulphur content also strips away the natural lubricity of diesel due to the loss of nitrogen- and oxygen-based polar trace elements. This has led some people to suggest adding 2-stroke oil to diesel fuel as a way to enhance lubrication and protect engine components.
Proponents of adding 2-stroke oil to diesel fuel argue that it is a cost-effective solution to improve lubrication, especially in older diesel engines. They claim that the 2-stroke oil won't turn diesel into gum when mixed and can help prevent issues like stalling in certain vehicles. Additionally, they suggest that the addition of 2-stroke oil can compensate for the perceived inadequacy of lubricity in modern diesel fuel. Some individuals have shared their positive experiences with using 2-stroke oil in online forums, stating that it has helped improve lubrication and engine performance.
On the other hand, there are strong arguments against adding 2-stroke oil to diesel fuel. Firstly, it is important to recognize that fuel suppliers are required to restore the lost lubricity in ULSD by adding specific additives. The absence of widespread engine failures and complaints indicates that these additives are effectively maintaining lubricity. While adding 2-stroke oil may not cause direct harm, there is also insufficient evidence to support its effectiveness in enhancing lubrication. Additionally, concerns have been raised about the high zinc content in 2-stroke oil, which can foul injectors in modern diesel engines.
Furthermore, some individuals have shared their negative experiences with using 2-stroke oil in diesel fuel. They report that it can cause excessive smoking, inadequate lubrication, and problems in high-revving engines. It is worth noting that modern engines with emission components may be susceptible to damage or reduced lifespan when extra oil is added. Instead of relying on 2-stroke oil, engine owners are advised to use products specifically designed and tested for improving lubricity, such as Opti-Lube XL, which has been proven to effectively reduce wear.
In conclusion, while the addition of 2-stroke oil to diesel fuel may be tempting due to the perceived loss of lubricity in ULSD, it is not a universally accepted practice. The effectiveness of 2-stroke oil in enhancing lubrication is questionable, and there are concerns about potential negative impacts on modern engines. It is advisable to consult with experts or follow manufacturer recommendations for maintaining engine lubrication rather than relying on unverified solutions.
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TC-W3 oil
TC-W3 is a two-stroke oil that can be used as a fuel additive in diesel engines. It is designed to lubricate engine parts as it passes through the engine and is burned along with the fuel. This type of oil is typically mixed with the fuel before combustion, either by being physically combined or, in the case of direct fuel injection, mixed in the combustion chamber.
TC-W3 has been shown to be an effective lubricant for diesel engines, particularly those with mechanical injector pumps like the Bosch VP44, where proper lubrication is critical. It is added to the fuel at a ratio of around 1 ounce of TC-W3 per 5 to 8 gallons of fuel, depending on various factors such as the engine type and desired level of lubrication.
Some users have reported that adding TC-W3 to their diesel fuel has resulted in quieter engines and improved fuel mileage. It is also a relatively inexpensive option compared to other fuel additives and lubricants.
However, there are some concerns about the potential negative effects of using TC-W3 in diesel engines. Some users have cautioned that extended use may clog the catalytic converter, while others have noted that using too much TC-W3 can negatively impact fuel mileage and engine performance. It is important to carefully calculate and measure the amount of TC-W3 added to the fuel to avoid these issues.
Overall, TC-W3 can be a beneficial additive for diesel engines, providing improved lubrication and potentially extending the life of engine components. However, it is important to use it judiciously and be aware of the potential drawbacks.
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Engine oil and diesel mix ratio
Mixing engine oil with diesel fuel is generally not recommended as it can cause serious engine complications and reduce the lifespan of the engine. However, some people do add small amounts of engine oil to their diesel fuel for various reasons.
One reason is to improve lubrication in older engines. Over time, the seals and injector nozzles in diesel engines can wear down, allowing diesel fuel to mix with the oil. This can result in a lack of lubrication in the engine, leading to increased friction and wear and tear. Adding a small amount of engine oil to the diesel fuel can help improve lubrication and protect the engine. However, it's important to note that modern diesel fuel already contains additives that provide lubrication, so additional lubrication may not be necessary unless there is a problem with the injection pump or injectors.
Another reason for adding engine oil to diesel fuel is to improve performance and keep the engine clean. Some people believe that adding a quart of automatic transmission fluid (ATF) or 2-stroke oil to the diesel fuel every few tanks can help keep the engine running clean and improve performance. However, it's important to note that these substances are not designed to be used as fuel additives and may not be compatible with all engines.
When it comes to the mix ratio of engine oil to diesel fuel, opinions vary. Some people recommend adding 1 ounce of engine oil per gallon of diesel fuel, while others suggest a ratio of 200:1 or even higher for 2-stroke oil. However, it's important to note that 2-stroke oil is designed to mix with gasoline, not diesel fuel, and may not provide the desired results. To make a measurable difference in lubricity, a ratio of greater than 50:1 is needed, which means adding 1/3 to 1/2 gallon of oil per 15-20 gallon tank.
Overall, while adding engine oil to diesel fuel may provide some benefits in certain situations, it is generally not recommended as it can cause serious engine complications and reduce the lifespan of the engine. It is always best to consult a mechanic or diesel fuel expert before adding any substances to diesel fuel.
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Injector pump lubrication
The lubrication characteristics of fuel injection pumps vary depending on the type of fuel oil used. Medium-speed diesel engines use fuel oils with various viscosities, such as heavy fuel oil (HFO) and light diesel oil (LDO). When a low-viscosity fuel oil is used, both the fuel oil and lubricating oil contribute to the lubrication of the system.
The lubrication characteristics of a fuel injection pump are poor when transitioning from a high- to low-viscosity fuel oil. This is due to the viscosity in the new oil section dominating the lubrication characteristics. However, the used oil section can improve lubrication in this scenario. The clearances of the stem and head also influence the lubrication characteristics when the fuel oil changes.
Grooves on the stem part of a plunger can improve the lubrication characteristics of a fuel injection pump (FIP). Hydrodynamic lubrication analysis has been used to evaluate the changes in lubrication characteristics with variations in clearance, viscosity, and grooves. The two-dimensional Reynolds equation is used to evaluate lubrication characteristics with variations in viscosity, clearance, and profile for a laminar, incompressible, and unsteady-state flow.
The process used to remove sulfur from diesel fuel reduces its lubricity. This is because the refinery has to hydro wash the fuel, removing other components that provide lubrication. Reputable refineries add lubricity agents, but some people choose to add their own. Vegetable oils, such as canola or sunflower oil, have been suggested as additional lubricants in diesel systems. Some people also use fuel additives to improve lubrication, with TC-W3 being recommended by some diesel owners.
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Frequently asked questions
Yes, adding motor oil to diesel fuel will help lubrication. However, it is important to note that only clean, non-waste oil should be used.
There are a few options for adding lubrication to diesel fuel. These include 2-cycle oil, TC-W3 oil, vegetable oil, and castor-based 2T oil. It is important to note that not all oils are suitable for use in diesel engines, and some may have negative effects on engine performance.
The amount of motor oil added to diesel fuel for lubrication can vary depending on the specific engine and fuel. Some sources suggest adding 1 liter of motor oil to 70 liters of diesel fuel, while others recommend a 2% mixture of bio-diesel to regular diesel. It is important to consult a professional or refer to the engine's manual before adding any oil to diesel fuel.
Yes, while adding motor oil to diesel fuel can improve lubrication, it may also have negative consequences. Some oils may not mix properly with diesel fuel, leading to settlement at the bottom of the fuel tank. Additionally, the use of certain oils may void the warranty of the vehicle or engine. It is important to consult a professional or the engine manufacturer before adding any oils to diesel fuel.
Yes, there are alternative methods to improve lubrication in diesel engines. One method is to use a biodiesel mixture, which can increase lubricity by nearly 60% even at low concentrations of 2%. Another method is to use a fuel additive specifically designed to improve lubrication, such as TC-W3. These alternatives can provide the necessary lubrication without the potential risks associated with adding motor oil to diesel fuel.
