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In the four-stroke cycle the first down stroke sucks air into the piston, which is compressed by the up stroke.
All current industrial engine offerings are four-stroke cycle diesel engines and swept displacement below 3 L.
The four-stroke cycle used in most automotive engines today is usually credited to a German traveling salesman, Nicolaus Otto, who was intrigued by the possibilities of the internal combustion engine.
Monograde or multigrade oil is stored in the integral sump system usually beneath the engine as is commonly applied in four-stroke cycle engine practice.