How Much Oil Does a Semi Truck Differential Take?

Semi trucks are the workhorses of the commercial transportation industry, hauling supplies and goods across the United States and beyond. A semi truck’s differential is an important component which transfers power from the engine to the drive axles.

It helps keep the axles in synchronization so that they turn at the same speed. The differential also absorbs shock from uneven road surfaces, reducing wear and tear on the drivetrain components.

Differentials require oil to lubricate their moving parts, helping them last longer and run more efficiently. Semi truck differentials usually use a special type of oil called gear lube or hypoid gear oil. This type of oil is designed to protect against wear caused by high-pressure contact between gears, as well as heat buildup due to friction.

The amount of gear lube needed for a semi truck differential will depend on its size and type. Most medium-sized semi trucks have a differential that holds between 10 and 15 quarts (9-14 liters) of oil.

Heavy-duty trucks may require up to 20 quarts (19 liters) of oil for their larger differentials. Before adding any oil, it’s important to check your owner’s manual or consult with a qualified technician to determine the correct amount for your truck.

It is also important to note that gear lube is not interchangeable with motor oil. Motor oil does not have the same properties as gear lube and can cause damage if used in a differential. It’s best to use only fresh, high-quality gear lube that meets or exceeds your vehicle manufacturer’s specifications when servicing your semi truck’s differential.

In conclusion, how much oil does a semi truck differential take? It depends on the size and type of the differential; most medium-sized semi trucks will require 10-15 quarts (9-14 liters) while heavy-duty trucks may need up to 20 quarts (19 liters). Gear lube should always be used in differentials since it has properties which are not found in motor oil.


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Karen Watkins