W in the SAE classification indicates that the oil is suitable for winter operating conditions.
15.0 Application range and viscosity grades:
A = engine oils for gasoline engines
B = engine oils for diesel engines
* = low viscosity oil. Not suitable for 2.0 liter petrol engines (150 hp)
As for low-viscosity oils, we are talking about all-weather oils, which include additives that facilitate the coefficient of friction, as a result of which there is a decrease in friction of internal engine parts. The basis of easy-flowing oils is synthetic oil. When buying oil, you should pay attention to whether it is approved by RENAULT for use.
Due to the fact that the fields of application of adjacent oils according to the SAE classification overlap, short temperature fluctuations can be ignored. It is allowed to mix oils of different viscosities if it is necessary to add oil, and the ambient temperatures do not correspond to the viscosity class of the oil filled into the engine.
Attention! Lubricating additives of any kind must not be added to fuels or lubricating oils.
Engine oil specification
Classification of motor oils of American manufacturers is carried out according to the API system: an abbreviation from the first letters of the American Petroleum Institute (American Petroleum Institute). European oil producers also use this classification.
The designation is made using two letters. The first letter indicates the scope: S - for internal combustion engines, C - for diesel engines. The second letter indicates the quality of the oil in alphabetical order. The highest quality oils are of specification SH for internal combustion engines and CF for diesel engines.
European oil manufacturers use the CCMS specification, which takes into account European engine technology in particular. Oils for gasoline engines, depending on the quality, are divided into classes CCMC-G1 to G5, and for diesel engines of passenger cars - CCMC-PD1 and more expensive CCMC-PD2 oil.
European Commission CCMS withdraws from ASEA (Association des Constructeurs Europens d’Automobiles), which performs its own testing and sets its own criteria for oil quality. Oils for gasoline engines of passenger cars have ACEA classes from A1-96 to AZ-96; for diesel engines -classes from B1-96 to VZ-96. Oils of the highest quality are AZ oils for gasoline and B3 oils for diesel engines.
The numbers 96 indicate the beginning of the ACEA classification in 1996. Oils with earlier data are also approved for use.
Attention! Engine oils labeled by the manufacturer as being for diesel engines only cannot be used in gasoline engines. However, there are oils that are suitable for both gasoline and diesel engines. In such cases, both specifications are printed on the packaging of motor oils intended for both gasoline and diesel engines (eg CCMC-G5/PD2 or AP! SG/CD).
Recommended engine oil for Renault Megane
Cars with gasoline engines: engine oil must meet the minimum requirements of API-SH, CCMC-G4, ACEA-A2-96 for multigrade oils and API-SJ, CCMC-G5, ACEA-AZ-96 for low viscosity oils.
Diesel vehicles: API-CF, CCMC-PD2, ACEA-B2-96 or ACEA-B2-96.
Oil consumption
Oil consumption in internal combustion engines refers to the amount of oil that is produced as a result of the combustion process. In no case should oil consumption be identified with oil losses that occur as a result of leaks due to leaks in the oil pan, cylinder head cover, etc.
Normal oil consumption occurs as a result of the combustion of small amounts of oil in the cylinders, the removal of combustion residues and particles formed as a result of vision. In addition, oil is consumed by the high temperatures and high pressures it is constantly subjected to in the engine. In addition, the degree of oil consumption is influenced by external operating conditions, driving mode, as well as operating tolerances. Oil consumption should not exceed 1 liter per 1000 kilometers.
Be sure to add oil when the level reaches the bottom mark.
Attention! Do not fill oil above the maximum mark on the reservoir. If too much oil was poured during refueling, then remove or drain the excess. Otherwise, unburned oil entering the exhaust system may damage the catalyst.