Engine, or motor, oil is designed to lubricate the inner components of internal combustion engines, as well as to protect them against corrosion and keep them cool while in use.

Engine oils are rated by their grade and viscosity. Any oil can either be single-grade, with a set viscosity level, or multi-grade in which the oil can act at two different viscosities depending on its temperature. The latter is most prevalent today, to cater for vehicles used all year round in various conditions. The flow-rate of both single- and multi-grade oils is measured on a viscosity grade scale, which includes 11 grades ranging from 0 to 60. Lower-ranked oils are thicker than higher-ranked ones, making them more suitable to hot environments, and vice versa.

Why Engine Oil is Important

  • Helps to reduce heat build-up within the engine –Heat is produced from the friction of engine parts and excessive heat can cause substantial damage to vital engine components. As oil moves around the engine heat is carried away to cooler parts. This dissipation of heat means that no one area of the engine should become too hot.
  • Keeps the engine clean –This is vital to keep the engine running at maximum efficiency. Oil picks up debris and dust particles and carries them to the oil filter where they become trapped. This reduces the risk of dirt building up in the engine and causing damage to the engine.
  • Protects the engine parts from corrosion –One of the additives present within the majority of oils is specifically there to help to reduce oxidation and prevent corrosion.
  • To help to improve fuel efficiency – The slipperier the engine parts then the less force required to move them so less fuel is used by the engine.