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Diesel Engine

A Diesel Engine requires diesel fuel rather than gasoline. Diesel fuel undergoes a different refining process from petroleum, which gives it more usable energy. This makes diesel engine cars more fuel-efficient than gasoline powered engines. The downside to diesel engines is that diesel fuel tends to cost more than gasoline in the United States.

Differential Fluid

The axles of your car are called differentials. The interior of a differential has gears in it that require lubrication. Differential Fluid is the gear oil for the differential. If you notice that differential fluid is leaking, you should have it checked to prevent damage to the axle.

Disc Brake

A Disc Brake is a brake design where brake pads attached to calipers are pressed against a brake disk (rotor) to slow down and stop the car. Brake pads must be replaced once they are worn down so that the brake disk does not become damaged. Not only are damaged rotors expensive to repair, they can cause uneven tire wear and hinder your car’s ability to brake properly.

Drive Belt

The Drive Belt, which is the large belt you see when you open the hood of your car, is a belt that powers the alternator, water pump, power steering, A/C compressor, and air pump. It should be replaced according to your manufacturer’s specifications or if you see cracks in the belt. If the belt breaks, your car will not run.

Drive Shaft

The Drive Shaft is a metal rod that is connected at one end to the transmission, and on the other end to the differential. It transmits torque from the transmission and creates rotation. This mechanism is connected with joints and seals that are susceptible to wear and sometimes need replacing.

Drive System

The Drive System refers to the type of system driving your car. Front-wheel drive, rear-wheel drive, all-wheel drive are all types of drive systems.

Drive Axle Boots

The Drive Axle Boot is the rubber piece that covers the CV joints. These rubber boots deteriorate over time. If cracks and tears in a boot occur, the grease protecting the CV joints will leak out and dirt will get into the joint, causing the joint to fail. When you get your oil changed, have the mechanic inspect the drive axle boots to assess their condition.


The Drivetrain, also known as the powertrain, is made up of three components: the engine, the transmission, and the wheels. This includes the clutch, the transaxle, the CV joints, the differential, axles, and drive shaft of the car—basically everything that sends power from the engine to the wheels.

Drum Brakes

Drum Brakes are a type of braking system that uses a drum and a brake shoe that applies friction to the drum in order to slow down and stop the car. Because brake drums are large, drum brakes are used in most heavy trucks and many light and medium trucks. Older model cars may use drum brakes, but newer automobiles typically feature a different type of braking system.