Antifreeze is used as an engine coolant and commonly consists of ethylene glycol or propylene glycol. Antifreeze breaks down over time and forms acids, which corrode the vehicle’s cooling system. During its use, antifreeze may become contaminated with traces of fuel, metal particles, and grit. Benzene, lead and other hazardous constituents may cause used automotive antifreeze to be characterized as a hazardous waste. 

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