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Engine and Powertrain: The Heart of the Machine The John Deere 300, produced from 1965 to 1973, offered a choice between a robust 2.5-liter diesel engine or a 2.2-liter gasoline engine, both delivering 43 horsepower. While both provided ample power for various farm tasks, key differences existed. The diesel, boasting a significantly higher compression ratio (16.7:1 vs. 7.5:1 for gasoline), likely offered superior fuel efficiency and greater torque – crucial for heavier loads....