Functions of the engine oil


The primary role of the oil is to reduce frictional resistance between moving parts and reduce wear. The 2 main physic-chemical constraints on the lubricant are shear and temperature. The other functions of the oil are to cool the engine, ensure the tightness.

A last generation engine can reach very high temperatures in terms of segmentation. On the order of 400 ° C. The circulation of the oil in the engine allows to evacuate the calories and to cool it. The oil also keeps the engine clean, waterproof and protects it from corrosion.

Numerous indices and standards govern the choice of engine oil such as 5W30, 5W40, 10W40, 15W40 and many others for petrol or diesel engines.

It is quite difficult to choose the right engine oil to empty your car alone.

Engine oil 5W30

5W30 engine oil provides many benefits for your vehicle:

  • Fuel economy
  • Easier start
  • Latest generation engine
  • Particle filter protection (FAP)
  • Catalyst protection
  • Extreme engine protection
  • Low and High Temperature Protection
  • Environmental Protection
  • Long drain intervals

Characteristics of the engine oil

The role of the engine oil is to reduce the wear of parts of an engine by reducing any resistance due to friction between moving parts in the engine. The engine oil also has the mission to protect against corrosion, to ensure the cleanliness and the tightness of the engine. Finally, the circulation of the oil in the engine makes it possible to evacuate the calories and thus to cool the engine which can reach temperatures around 400 ° C.

Why choose your engine oil?

Oil suitable for your vehicle reduces friction and saves fuel and therefore reduces CO2 emissions.

How to choose the engine oil?

The first step is to check the vehicle’s maintenance log, the viscosity of the oil and the standards and specifications required by the manufacturer. If you do not have the maintenance booklet it is strongly advised to contact a professional.

Choose your oil according to the type of vehicle and the route

Here is a table summarizing and simplified according to the type of engine and the type of journey:

Vehicle motorization


Engine oil
Petrol and Diesel Direct Injection with FAP *

City + Route + Highway

5W30 ACEA C1 – C4

Petrol and Diesel Direct injection without FAP *

City + Route + Highway

5W40 ACEA A3 / B4

Petrol / Diesel turbo Indirect injection

City + Route

Petrol / Diesel turbo Indirect injection Road