We had to drain the oil out of the engine.

我们必须把发动机里的机油全部放掉。

《牛津词典》

If you must deep fry, be sure to drain the food on kitchen paper, turning it a few times to drain off as much oil as possible.

如果你一定要油炸，一定要把食物放在厨房的纸上，翻动几次尽量把油吸干。

youdao

Today, we import about 60 percent of the oil we use, which is a huge drain on our economy and which weakens our security.

今天，我们使用的石油约有60%来自进口，这对我国经济是巨大的消耗，并削弱了我国的安全。

youdao

You can damage your engine if you're not careful to use the right oil filter and replace the oil-drain plug without stripping its threads, or forget a leak-stopping gasket.

WSJ: Diagnostic Tools to Unleash Your Inner Mechanic

Irene can serve as our wake-up call, a reminder to look elsewhere for our energy needs: instead of pouring our money down the drain, funding oil despots overseas, our money should stay right here at home, where renewable energies can increasingly serve as an economic multiplier the likes of which Americans have never before experienced.

FORBES: Hurricanes Drive Home Appeal Of Alternative Energy Sources

Never put chemicals or oil down the drain -- they will contaminate rivers and then make its toxic way into our oceans.

CNN: The stark reality of a throw-away society