A dipstick is used to measure how much oil is left in an engine.

量油尺是用来探查引擎中的剩余油量的。

《牛津词典》

But because it will be used only intermittently, at times the Volt's conventional engine will turn on merely to circulate oil and other fluids.

但因为只在间歇时启用，有时Volt的普通发动机仅仅在油路或其他液路循环是才会启动。

youdao

Main products: filters and filter elements for air engine oil and fuel filtering. used in automobiles. tractors. powerful diesel engine s. construction machines. and oil tankers etc.

主要产品：汽车、拖拉机、大马力柴油机、施工机械、重油船用柴油机用的空气、机油、燃油三大系列的滤清器、滤芯。

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United mechanics who inspected the engine found that two shop towels had been used to cover openings in the oil sump area, instead of protective caps.

CNN: US Airways, United face FAA fines for safety violations