Back in the early-mid 90s I had a buried oil tank I wanted to get rid of before I became a superfund site. The tank removal company wanted to charge for oil removal, calling the old oil hazardous material to be disposed of. I called the town, and they came, pumped out practically all the oil for use in heating either the highway dept. garage or the building at the dump. I excavated around the near empty tank by hand, and the eventual tank removal came in pretty cheap.
"Old" heating oil and engine oil is used easily as fuel, after filtering. At the town dump, they have a setup for collecting used engine oil, even from filters. Free disposal opportunity!
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