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Two-stroke engine
In the case of a two-stroke engine, the oil is mixed with the fuel and lubricates the engine as it circulates, and is burned during the operating process. This is the main reason why a two-stroke engine consumes more oil than a four-stroke engine. It's also why oil needs to be added regularly to a two-stroke engine, and in particular to a "classic" carburetor-driven two-stroke engine.
While the basic principle remains the same for direct-injection two-stroke engines, they use much less oil and, above all, burn a much smaller quantity of oil.
