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Eucalyptus Oil as a Fuel Additive: Separating Scientific Potential from Real-World Risks

by Iffa Jayyana July 19, 2026

written by Iffa Jayyana

Jakarta, Indonesia – A widespread claim asserting that mixing eucalyptus oil (minyak kayu putih) with gasoline can significantly enhance fuel efficiency has garnered considerable attention across social media platforms in Indonesia. Numerous online posts have suggested that this concoction could lead to notable improvements in vehicle fuel consumption, sparking both curiosity and debate among the public. This popular contention has subsequently been linked to a series of academic investigations conducted by various universities, exploring the potential application of eucalyptus oil as a bio-additive in gasoline. The findings from these studies, while intriguing, have elicited diverse reactions and raised critical questions among motorists and experts alike, prompting a deeper examination of the scientific validity and practical implications of such a practice.

The discussion surrounding eucalyptus oil as a fuel additive underscores a perennial public interest in innovative, often low-cost, methods to mitigate rising fuel expenses and reduce environmental impact. In an era where economic pressures and environmental consciousness are paramount, the allure of a simple, natural solution to optimize vehicle performance is undeniably strong. However, the intersection of anecdotal evidence, preliminary scientific research, and expert warnings necessitates a thorough, objective analysis to distinguish between promising laboratory results and safe, viable real-world applications. This article delves into the scientific underpinnings of the claim, scrutinizes the findings of relevant research, and presents the cautionary perspectives of energy conversion specialists and regulatory bodies, providing a comprehensive overview of whether adding eucalyptus oil to gasoline truly delivers on its promise of fuel economy.

The Viral Claim and Its Origins: A Social Media Phenomenon

The genesis of the eucalyptus oil fuel efficiency claim can be traced back to a burgeoning trend on social media, where various users began sharing personal anecdotes and "experiments" touting the benefits of this unusual additive. Videos and posts demonstrating the supposed process of mixing small quantities of eucalyptus oil with gasoline, followed by testimonials of improved mileage, rapidly gained traction. This phenomenon reflects a broader pattern of information dissemination in the digital age, where unverified claims can quickly go viral, especially when they tap into common consumer anxieties like fuel costs. The accessibility of eucalyptus oil, a common household item in Indonesia known for its medicinal and aromatic properties, further contributed to the ease with which individuals could attempt these "hacks."

The timing of this trend is also significant. Periods of fluctuating or increasing fuel prices often correlate with a heightened public interest in fuel-saving alternatives, ranging from legitimate aftermarket products to speculative home remedies. The promise of significant savings, sometimes quoted in the realm of 30-40% improvement, was a powerful motivator for many to experiment, despite the absence of official endorsements or rigorous long-term testing. This social media momentum created a fertile ground for the claim to propagate, drawing attention not only from individual users but also from academic institutions and regulatory bodies who recognized the need for scientific clarification.

Scientific Inquiry: The Promise of Eucalyptol as a Bio-additive

From a chemical perspective, eucalyptus oil is classified as an essential oil, with its primary component being 1,8-cineole, commonly known as eucalyptol. This organic compound is particularly interesting due to its inherent oxygen content. In the context of fuel chemistry and combustion, oxygenates – substances that introduce oxygen into the fuel mixture – are known to potentially facilitate a more complete combustion process. When fuel burns more completely, it theoretically releases more energy, leading to improved engine efficiency and, consequently, lower fuel consumption. This scientific premise forms the basis of the academic investigations into eucalyptus oil’s potential as a bio-additive.

Several research endeavors, predominantly from Indonesian universities, have explored this hypothesis. Among the most frequently cited studies are those published in the Jurnal Transmisi Universitas Merdeka (UNMER) Malang and the Jurnal Pendidikan Teknik Mesin (JPTM) Universitas Negeri Surabaya (UNESA). Additionally, research conducted by Utomo and Arsana in 2020, and Winoko and Nugroho in 2021, have contributed to the body of evidence. These studies typically involved controlled laboratory environments, utilizing specific vehicle models and measuring various parameters such as fuel consumption, engine power, torque, and exhaust emissions.

One notable study, focusing on a Honda CS1 150 PGM-FI motorcycle, reported compelling results. It indicated that a mixture containing approximately 8 percent eucalyptus oil could potentially reduce fuel consumption by an impressive 35.78 percent. Furthermore, the study observed an increase in engine torque by about 2.22 percent and a power boost of 2.53 percent. Crucially, the research also highlighted a reduction in harmful emissions, specifically carbon monoxide (CO) and hydrocarbons (HC), suggesting potential environmental benefits alongside performance enhancements. These findings, if replicable and sustainable in real-world conditions, would represent a significant breakthrough in fuel technology.

Another investigation, conducted on a Honda Supra X 125R, explored the effects of adding approximately 4 milliliters of eucalyptus oil per liter of gasoline. This study similarly noted a tendency towards improved engine performance and a reduction in fuel consumption. The Jurnal Transmisi study by Winoko and Nugroho (2021) further corroborated these findings, observing an increase in engine power for a 150 cc motorcycle when using a mixture containing around 6 percent eucalyptus oil.

However, these academic studies also introduced important caveats. The Winoko and Nugroho research, for instance, revealed that while a 6 percent mixture showed positive results, a higher concentration of 9 percent eucalyptus oil did not yield further improvements and, in some cases, showed diminished returns. This suggests the existence of an "optimal composition," beyond which the benefits may plateau or even reverse, a common characteristic in chemical additive formulations. Such findings underscore the complexity of fuel chemistry and the critical need for precise formulation when developing new additives.

Expert Consensus: Caution and Unanswered Questions

Despite the promising initial laboratory results, experts in energy conversion and fuel technology have consistently urged caution. Prof. Tri Yuswidjajanto Zaenuri, an energy conversion expert from the Faculty of Mechanical and Aerospace Engineering at the Bandung Institute of Technology (ITB), acknowledges that eucalyptus oil has indeed been associated with potential engine performance enhancements for some time. However, he highlights a critical concern: the inherent characteristics of eucalyptus oil could potentially reduce the lubricity of the fuel if used continuously.

Lubricity is a vital property of fuel, particularly for modern fuel injection systems and internal engine components. Gasoline and diesel fuels are formulated to provide a certain level of lubrication to components they come into contact with, such as fuel pumps, injectors, and cylinder walls, preventing premature wear and tear. If an additive significantly diminishes this lubricity, it could lead to increased friction, accelerated wear of crucial engine parts, and ultimately, costly mechanical failures. Prof. Zaenuri emphasizes that, to date, no long-term studies have conclusively demonstrated the safety of continuous eucalyptus oil use on vehicle fuel systems and engine components. The short duration of laboratory tests, typically conducted over hours or days, cannot replicate the cumulative effects of months or years of regular use.

Furthermore, Prof. Zaenuri suggests that any perceived fuel savings experienced by individual users might be relatively small and potentially influenced by subjective perception rather than significant measurable improvement. This phenomenon, often referred to as the "placebo effect" in consumer products, can lead individuals to believe a product is effective simply because they expect it to be.

Adding to the expert warnings, Muhamad Fuad, a researcher from the Oil and Gas Testing Center (LEMIGAS), affirms that eucalyptus oil does possess intriguing characteristics as a potential bio-additive candidate, particularly its calorific value and oxygen content. However, he unequivocally states that its utilization as a commercial additive still necessitates extensive further research. Key areas requiring investigation include the stability of the mixture over time, its compatibility with existing fuel system materials (such as rubber seals, plastics, and metals), and its long-term impact on engine durability. Without comprehensive data addressing these concerns, recommending eucalyptus oil as a fuel additive for general public use remains premature and potentially hazardous.

Beyond the Lab: Real-World Risks and Regulatory Stance

The fundamental issue with adding unauthorized substances like eucalyptus oil to commercial gasoline lies in the alteration of established fuel specifications. Fuel manufacturers, such as Pertamina in Indonesia, meticulously formulate their products to meet stringent national and international standards. These specifications encompass a wide range of parameters, including octane rating, volatility, density, sulfur content, and crucially, the precise blend of additives designed to protect engine components, prevent corrosion, and ensure optimal combustion.

Introducing any substance outside of this official formulation can fundamentally change the quality and characteristics of the fuel. Once modified with an external additive, the fuel no longer conforms to the original specifications set by the producer. This non-compliance carries several significant risks for vehicle owners. Foremost among these is the potential to void vehicle warranties. Automotive manufacturers typically specify the type of fuel approved for their vehicles and explicitly warn against the use of unauthorized additives, as these can lead to damage not covered under warranty.

Beyond warranty implications, the physical and chemical interactions of eucalyptus oil with various engine components are largely unknown in a long-term, real-world context. Modern engines are highly complex and engineered with tight tolerances. The introduction of an unknown variable could lead to:

Corrosion: Certain essential oil components might react with metals or plastics in the fuel system, leading to corrosion or degradation.
Deposit Formation: Incomplete combustion of eucalyptus oil or its reaction products could lead to undesirable deposits on fuel injectors, valves, or spark plugs, impairing engine performance and potentially causing blockages.
Material Compatibility Issues: Gaskets, seals, and hoses in the fuel delivery system are designed to withstand specific chemical environments. Eucalyptus oil might degrade these materials, leading to leaks or system failures.
Emissions Impact: While some studies showed reduced emissions in controlled settings, unregulated additives could lead to unforeseen changes in exhaust gas composition, potentially increasing other harmful pollutants or damaging catalytic converters.

Regulatory bodies and fuel companies consistently advise against the practice of adding any unauthorized substances to fuel. This stance is rooted in a commitment to consumer safety, environmental protection, and the maintenance of product quality and integrity. The Ministry of Energy and Mineral Resources (ESDM) in Indonesia, through agencies like LEMIGAS, plays a crucial role in setting and enforcing fuel quality standards. Their caution underscores the importance of adhering to tested and approved fuel formulations.

Broader Context: The Quest for Fuel Efficiency and Bio-additives

The interest in eucalyptus oil as a fuel additive is not an isolated phenomenon but rather a microcosm of a broader, global quest for enhanced fuel efficiency and the development of sustainable bio-additives. Researchers worldwide are continuously exploring alternative fuels and fuel additives derived from biomass, aiming to reduce reliance on fossil fuels and mitigate environmental impact. Bioethanol, biodiesel, and various essential oils have all been subjects of extensive research for their potential to improve combustion, reduce emissions, or serve as renewable fuel components.

The development of successful bio-additives, however, is a complex and capital-intensive process. It involves not only identifying promising compounds but also conducting exhaustive testing to ensure:

Performance: Consistent and measurable improvements in fuel efficiency, power, or emissions.
Stability: The additive does not degrade over time or in various storage conditions.
Compatibility: It does not negatively interact with fuel system components or other standard fuel additives.
Toxicity and Environmental Impact: It is safe for humans and the environment throughout its lifecycle.
Scalability and Cost-effectiveness: It can be produced economically and in large quantities.

The rigorous process of bringing a new fuel additive to market typically involves years of laboratory testing, engine bench tests, field trials, and regulatory approvals. This stringent approach is necessary to prevent unintended consequences that could harm consumers, damage vehicle fleets, or degrade air quality. The enthusiasm for eucalyptus oil, while understandable given its potential, must therefore be tempered by the reality of this complex development pathway.

Economic and Environmental Implications

The economic implications for consumers considering the use of eucalyptus oil as a fuel additive are a double-edged sword. While the initial allure is the promise of significant fuel savings, the potential long-term costs associated with engine damage or premature wear could far outweigh any short-term benefits. The expense of repairing or replacing critical engine components, such as fuel pumps, injectors, or catalytic converters, can be substantial, rendering any perceived savings negligible or even negative. Furthermore, the voiding of warranties means that consumers would bear the full financial burden of these repairs.

From an environmental perspective, the situation is equally nuanced. While some studies indicated a reduction in certain regulated emissions like CO and HC in controlled environments, the broader environmental impact of widespread, unregulated use of eucalyptus oil as a fuel additive remains unknown. If the mixture leads to incomplete or altered combustion patterns in real-world driving conditions, it could potentially generate other harmful, unregulated pollutants. Moreover, if engine damage occurs, it could lead to increased oil consumption or other issues that negatively impact the environment. The precise chemical byproducts of eucalyptus oil combustion in an internal combustion engine, especially over extended periods and across various engine designs, have not been thoroughly characterized for environmental safety.

The Path Forward: Rigorous Testing and Consumer Awareness

In conclusion, while preliminary academic research presents intriguing possibilities regarding the potential of eucalyptus oil as a fuel bio-additive, the current body of evidence is insufficient to recommend its widespread adoption. The findings, primarily derived from short-duration laboratory tests, highlight potential benefits under specific, controlled conditions. However, these benefits have not been validated through comprehensive, long-term real-world testing that assesses the additive’s stability, compatibility with diverse fuel systems, and its impact on engine durability over extended periods.

The consensus among energy conversion experts and regulatory bodies is one of caution. Concerns regarding the potential reduction in fuel lubricity, the risk of engine component degradation, and the voiding of vehicle warranties are significant. Official recommendations from relevant sources, including fuel manufacturers and government agencies, strongly advise against adding any unauthorized substances to fuel, emphasizing the importance of adhering to established fuel specifications to ensure vehicle longevity and safety.

The enthusiasm surrounding eucalyptus oil as a fuel-saving solution underscores the public’s desire for innovative and affordable alternatives. This interest should serve as a catalyst for further, more rigorous scientific investigation. Future research must extend beyond initial performance metrics to include extensive long-term durability tests, comprehensive material compatibility assessments, and thorough environmental impact studies across a wider range of engine types and operating conditions. Until such comprehensive data becomes available and official endorsements are issued based on robust scientific validation, motorists are strongly advised to adhere to manufacturer recommendations and utilize only fuels and additives that meet established industry standards. The promise of potential savings must always be weighed against the very real risks of unforeseen and costly damage to one’s vehicle.

Pewarta: M. Hilal Eka Saputra Harahap
Editor: Suryanto
Copyright © ANTARA 2026

July 19, 2026 0 comment

Automotive

The Buzz Around Eucalyptus Oil in Gasoline: Separating Fact from Fuel-Saving Fiction

by Iffa Jayyana July 19, 2026

written by Iffa Jayyana

The digital sphere is currently abuzz with claims that infusing gasoline with eucalyptus oil can significantly enhance fuel efficiency in vehicles. Social media platforms have become hotbeds for discussions and shared posts championing this mixture as a potent solution for boosting fuel economy. This burgeoning online narrative has drawn a direct line to a series of academic investigations exploring the potential of eucalyptus oil as a bioadditive for gasoline. The findings from these studies have, in turn, ignited a spectrum of reactions and sparked considerable public curiosity, prompting a critical examination of the veracity of these claims.

The central question on many minds is: Does mixing eucalyptus oil with gasoline genuinely lead to more economical fuel consumption? To address this, a comprehensive review of existing research and expert opinions is crucial.

The Chemical Basis for Potential Efficacy

At its core, eucalyptus oil is classified as an essential oil, with its primary component being 1,8-cineole, also known as eucalyptol. This specific compound is notable for its oxygen content. Researchers have theorized that this inherent oxygen within eucalyptol could potentially facilitate a more complete combustion process when mixed with the air-fuel mixture inside an internal combustion engine. The hypothesis suggests that a more efficient burn could translate into better energy extraction from the fuel, thereby reducing the overall quantity of fuel required to achieve a given distance.

Several academic studies have been frequently cited in discussions surrounding this topic. Prominent among these are investigations published in the Jurnal Transmisi by Universitas Merdeka (UNMER) Malang, the Jurnal Pendidikan Teknik Mesin (JPTM) by Universitas Negeri Surabaya (UNESA), and research conducted by scholars Utomo and Arsana in 2020. These studies, among others, have provided a foundation for the growing interest in eucalyptus oil as a fuel additive.

Findings from Key Research Studies

One particularly influential study focused on a Honda CS1 150 PGM-FI motorcycle. The results indicated that a mixture containing approximately 8% eucalyptus oil was associated with a notable reduction in fuel consumption, reportedly by up to 35.78%. Beyond fuel savings, the research also documented positive impacts on engine performance, with an increase in torque of approximately 2.22% and a rise in power output of 2.53%. Furthermore, this study reported a decrease in harmful emissions, specifically carbon monoxide (CO) and hydrocarbons (HC), which are common pollutants from vehicle exhausts.

Another investigation, this time examining a Honda Supra X 125R, explored the effects of adding a smaller quantity of eucalyptus oil – approximately 4 milliliters per liter of gasoline. This research observed a discernible trend towards improved engine performance coupled with a reduction in fuel consumption.

Further lending credence to the potential benefits, a study published in the Jurnal Transmisi by Winoko and Nugroho in 2021 investigated the impact of eucalyptus oil on a 150cc motorcycle engine. Their findings revealed an increase in engine power when a mixture containing around 6% eucalyptus oil was used.

However, these studies also highlighted an important nuance: the concept of an optimal composition. The research by Winoko and Nugroho, for instance, indicated that higher concentrations of eucalyptus oil, such as 9%, did not yield superior results and, in some cases, might even be detrimental. This suggests that the effectiveness of eucalyptus oil as a fuel additive is likely dependent on precise ratios, implying a specific "sweet spot" for its application.

Expert Caution: The Caveats of Laboratory Findings

Despite the promising results from these laboratory-based studies, automotive and energy experts are urging caution. A significant point of contention is the extrapolation of these findings to real-world, long-term usage. The controlled environments of academic laboratories, often involving relatively short testing durations, may not accurately replicate the complexities and demands of daily driving conditions over extended periods.

Professor Tri Yuswidjajanto Zaenuri, an expert in energy conversion from the Faculty of Mechanical and Aerospace Engineering at the Bandung Institute of Technology (ITB), acknowledges the historical association of eucalyptus oil with engine performance enhancement. However, he raises a critical concern regarding the oil’s inherent properties. Professor Zaenuri points out that eucalyptus oil’s characteristics could potentially compromise the lubricity of the fuel if used continuously. Lubricity is a crucial factor in ensuring the smooth operation and longevity of fuel system components, including fuel pumps and injectors. A reduction in lubricity could lead to increased wear and tear, potentially resulting in costly repairs over time.

"Until now, there is no long-term research available that proves the continued use of eucalyptus oil mixtures remains safe for the fuel system components and engine of a vehicle after prolonged usage," Professor Zaenuri stated, underscoring the lack of longitudinal data.

He further suggests that any perceived fuel-saving effects might be marginal and potentially influenced by user perception. The psychological impact of believing a fuel-saving measure is in place could lead individuals to drive more conservatively, thus inadvertently achieving better mileage regardless of the additive.

Regulatory and Technical Perspectives

From a broader perspective, the practice of adding any substance not officially formulated into petroleum-based fuels (BBM) is generally discouraged. Regulatory bodies and fuel manufacturers adhere to stringent specifications to ensure fuel quality, performance, and engine compatibility. Introducing unauthorized additives, such as eucalyptus oil, can alter these established fuel specifications.

Industry sources and technical experts explain that modifying gasoline with unauthorized substances can adversely impact its inherent quality and characteristics. Once fuel has been altered from its original formulation, its performance may deviate from the standards set by the manufacturer, potentially voiding warranties and leading to unforeseen issues.

Muhamad Fuad, a researcher at the Oil and Gas Testing Center (LEMIGAS), acknowledges the chemical appeal of eucalyptus oil as a potential bioadditive candidate. He points to its calorific value and oxygen content as particularly interesting properties. However, Fuad emphasizes that its transition from a research subject to a commercial additive requires substantial further investigation. Critical areas requiring more in-depth research include the oil’s long-term stability, its compatibility with various fuel system materials and components, and its cumulative impact on engine durability.

"The utilization of eucalyptus oil as a commercial additive still necessitates further research concerning its stability, compatibility with fuel systems, and its impact on engine longevity," Fuad commented, reiterating the need for comprehensive validation.

The Verdict: Promising Potential, Unproven Practicality

In conclusion, while a select number of academic studies have presented compelling laboratory findings suggesting that mixing eucalyptus oil with gasoline could potentially enhance combustion efficiency and, consequently, lead to fuel savings and reduced emissions, these results remain largely confined to controlled environments. The current body of evidence is insufficient to definitively conclude that this practice guarantees more economical fuel consumption in everyday driving scenarios.

The observed improvements in fuel efficiency and engine performance in laboratory settings are promising. However, the critical missing piece is robust, long-term data demonstrating the safety and sustained efficacy of such mixtures under real-world driving conditions. The potential for reduced lubricity and the alteration of established fuel specifications are significant concerns that cannot be overlooked.

Until comprehensive, long-term studies validate the safety and consistent benefits of using eucalyptus oil as a fuel additive, consumers are advised to exercise caution. The pursuit of fuel economy is a valid goal, but it should not come at the expense of vehicle longevity and the integrity of the fuel system. Further research and development are undoubtedly needed to bridge the gap between laboratory potential and practical, reliable application in the automotive sector. The journey from a promising bio-component to a widely accepted and safe fuel additive is a complex one, requiring rigorous testing and a thorough understanding of all potential implications.

Broader Implications and Future Research

The widespread discussion around eucalyptus oil as a fuel additive highlights a growing public interest in sustainable and cost-effective transportation solutions. As fuel prices continue to fluctuate and environmental concerns mount, individuals are actively seeking alternatives and enhancements to conventional fuels. This interest underscores the demand for innovative bio-based solutions within the energy sector.

The research conducted by institutions like UNMER Malang, UNESA, and by individual scholars like Utomo and Arsana represents a valuable starting point. However, the path forward requires a collaborative effort between academia, industry, and regulatory bodies. Future research should focus on:

Long-term Durability Testing: Conducting extensive road tests over thousands of kilometers to assess the cumulative effects of eucalyptus oil mixtures on various vehicle components, including fuel injectors, fuel pumps, seals, and catalytic converters.
Compatibility Studies: Investigating the compatibility of eucalyptus oil with a wider range of fuel types and engine designs commonly found in the market.
Environmental Impact Assessment: Beyond CO and HC reduction, a thorough analysis of other potential emissions and their environmental impact is necessary.
Economic Viability: Evaluating the cost-effectiveness of producing and incorporating eucalyptus oil as a commercial additive, considering production scales and market prices.
Standardization and Regulation: If proven safe and effective, establishing clear guidelines and standards for its use, similar to other fuel additives.

The exploration of natural resources for fuel enhancement is a crucial step towards diversifying our energy sources and potentially reducing reliance on fossil fuels. The eucalyptus oil case serves as a pertinent example of how scientific inquiry can spark public discourse, but also underscores the rigorous scientific validation required before such innovations can be widely adopted. The scientific community’s ongoing efforts to explore and verify such possibilities will be instrumental in shaping the future of more sustainable and efficient transportation.

July 19, 2026 0 comment