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Motor oils with the specification SAE 10w40:

“SAE” is a community of automotive engineers (Society of Automotive Engineers), who are engaged in developing norms and classifications in the automotive industry, including setting motor oil viscosity indicators.

The viscosity class of sae 10w40 is deciphered as follows:

  • 10w is an all-season oil ("w" from English "winter") that retains its properties at temperatures down to -25o.
  • 40 - high temperature threshold - + 40o.

Thus, the presence of the SAE 10w40 marking on the package indicates the upper and lower temperature limits of the oil's operation, namely from -25o to + 40o.

Indicators of SAE 10w40 oil

It is important to understand what is meant by maintaining the performance of the lubricant. Synthetic and semi-synthetic motor oils 10w 40, subject to compliance with the specified temperature regime, should have the following properties:

  • Resistance to temperature changes. It was already said above that the marking itself indicates that the oil must maintain full performance in the temperature range from -25o to +40o. In addition, it should have a low solidification temperature and not become liquid in the heat. Likewise, oil is required to ensure reliable engine start-up in the winter season.
  • Protection against wear and corrosion of engine elements. This is the main purpose of any motor oil.
  • Cleaning functions. During the operation of the engine, metal shavings are formed, which, as they accumulate, will clog the channels, which will eventually lead to the breakdown of the working elements. Motor oils 10w 40 should wash foreign particles from the engine.
  • Have permission to use from popular car manufacturers. This will allow this material to be poured into the cars of popular manufacturers.
  • The density of motor oil 10w 40 is about 865 kg / m2.