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How much oil in a semi?

The amount of oil in a semi-truck can vary depending on the make and model of the truck, as well as the size of the engine. On average, a semi-truck can hold between 15 and 20 gallons of oil. Some larger trucks may hold up to 30 gallons of oil. The oil is used to lubricate the engine and keep it running smoothly. It is important to check the oil level regularly and add oil as needed to prevent the engine from overheating or becoming damaged.