What Are the Main Components of Waste Engine Oil?
2 Answers
Waste engine oil contains many harmful chemical components such as heavy metals, sulfur, phosphorus, and nitrogen compounds. The following is an introduction to waste engine oil: Introduction to Waste Engine Oil: Waste engine oil refers to the used oil that is replaced when the physical and chemical properties of the oil in various machinery, vehicles, ships, and equipment reach their respective oil change indicators. During use, the oil mixes with water, dust, other miscellaneous oils, and metal powder generated by component wear, causing the color to turn black and the viscosity to increase. Secondly, the oil gradually deteriorates, producing organic acids, colloids, and asphalt-like substances. Treatment of Waste Engine Oil: The treatment of waste engine oil should be carried out by units with a hazardous waste operation license for recycling and disposal.
As an automotive repair technician, I frequently deal with the topic of used motor oil. The main components of used motor oil are actually the base oil and additives from fresh oil that degrade after use. The base oil, typically mineral or synthetic oil, constitutes the majority but becomes oxidized, darkened, and thickened due to high engine temperatures. Additives such as detergents, dispersants, and anti-oxidants are depleted or rendered ineffective inside the engine. More critically, contaminants—metal particles from engine wear (like iron, aluminum, copper fragments), carbon particles, as well as water infiltration, unburned fuel residues, and acidic substances—make used oil hazardous, potentially carcinogenic and environmentally harmful. Analyzing used oil composition helps diagnose engine issues, e.g., high metal content indicates internal wear. Professionally collecting used oil for recycling at repair shops, rather than indiscriminate disposal, is standard practice. Understanding this encourages vehicle owners to prioritize regular oil changes and eco-friendly disposal.
