What is the calorific value of waste engine oil in kilocalories?

2 Answers
RichardDella
08/29/25 7:28am
The calorific value of waste engine oil is over 10,000 kilocalories. Formation of waste engine oil: During usage, engine oil becomes contaminated with water, dust, other miscellaneous oils, and metal particles from component wear, leading to darkening in color and increased viscosity. The oil gradually deteriorates, forming organic acids, gums, and asphalt-like substances. Regulations for waste engine oil disposal: The recycling and disposal of waste engine oil are strictly regulated by laws and regulations. Units generating hazardous waste must develop a hazardous waste management plan and report to the local environmental protection authorities at or above the county level regarding the types, quantities, flow directions, storage, and disposal of hazardous waste. Only units with hazardous waste operation qualifications are permitted to recycle and dispose of such waste.
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McBarrett
09/11/25 5:00am
The calorific value of waste engine oil typically ranges from 9,500 to 10,500 kcal per kilogram, which I consider a fairly reliable figure. Waste engine oil refers to used motor oil that may contain impurities, water, or other contaminants, causing its combustion heat to be slightly lower than that of fresh oil. Fresh engine oil can exceed 10,000 kcal, but after being used, its value decreases. In automotive maintenance, I often encounter questions about this, such as repurposing waste oil as heating fuel. However, one must be cautious about significant fluctuations in calorific value, which may lead to incomplete combustion—wasting resources and polluting the air. Practical lab tests show variations in calorific values depending on the source of the waste oil. Highly degraded or water-contaminated oil may drop below 9,000 kcal, making it unsafe and problematic for use as fuel. If an estimate is necessary, an average of 10,000 kcal is reasonable.
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