light oil engine

例句：

1. 1.The new car has a lightweight oil engine that makes it more fuel-efficient.
   这款新车搭载了轻质油发动机，使其更加省油。
2. 2. The old truck had a heavy oil engine that was difficult to start.
   那辆旧卡车搭载了重油发动机，启动起来很困难。
3. 3. The engineers are working on developing a new type of lightweight oil engine for the next generation of vehicles.
   工程师们正在研发一种新型轻质油发动机，用于下一代汽车。