What type of engine uses both gasoline and oil for lubrication?

The two-stroke engine is designed to use a mixture of gasoline and oil for lubrication. This design is essential because two-stroke engines have a simpler construction and fewer components than four-stroke engines, allowing for a more compact size. In a two-stroke engine, oil is mixed with the gasoline before it enters the combustion chamber. This mixture not only fuels the engine but also ensures that the moving parts are lubricated, helping to reduce friction and wear. The engine completes a power cycle with every two strokes of the piston, which means that the oil is consumed in the combustion process, making this lubrication method necessary for maintaining performance and longevity.

In contrast, a four-stroke engine uses a separate lubrication system, where oil is stored in a sump and circulated through the engine components, while diesel engines also rely on dedicated lubrication systems. Electric engines do not require fuel or oil for lubrication, as they operate on electrical energy.