Role and benefits of motor oil

The main role of engine oil is to lubricate the engine parts, which are constantly in friction. It thus reduces friction which tends to increase part wear.

The energy lost through combustion and the friction between mechanical parts causes the engine temperature to rise. Part lubrication provided by the engine oil helps to release the heat through the lubrication circuit. It supplements the coolant, which can only cool certain parts of the engine.

While less known, the cleaning power of motor oil is fundamental. Microscopic deposits build up in the engine and remain in suspension. They can consist of dust or combustion residue. Without motor oil, the residue would clog the engine and decrease its performance. The flow of motor oil continuously carries these impurities to the oil filter, where they are trapped. 

Fuel combustion generates corrosive acid that can damage metal parts in the engine. With the additives added to modern motor oils, corrosion is slowed down. Nonetheless, over time, and in contact with oxygen, motor oil may oxidise and no longer play its corrosion inhibiting role. That’s why engine oil must be changed regularly. 

Motor oil also enhances engine sealing, and more specifically the sealing of pistons and cylinders. A protective layer is deposited between the various parts, sealing any clearances that may arise. 

 

By reducing friction between parts and by cleaning the entire engine, motor oil prevents the engine from clogging and becoming damaged. Mechanical parts last longer and corode less. The engine therefore performs greater and its lifespan is increased.

An oiled engine runs better. Good lubrication is in fact essential to avoid serious mechanical damage. In addition to engine performance, the cost of maintenance is also affected.

If an engine oil is overused, or if its level is too low, the resulting friction alters the engine’s energy efficiency, which in turn increases fuel consumption. A high-performance oil also reduces polluting discharges in the atmosphere.