The difference between synthetics and semisynthetics.

Car owners often have a question, which oil is better to choose: synthetic or semi-synthetic? When choosing, it is necessary to take into account the following characteristics of the car: make, age, mileage and technical condition. You should also know the basic differences between synthetics and semi-synthetics.


Synthetic engine oil Is a product of artificial origin, obtained either by deep processing of oil or from natural gas by the method of molecular synthesis. It is little affected by external factors and almost does not change its properties with prolonged use.

Semi-synthetic oil is obtained by mixing two different bases in the following proportions: 30-50% synthetics and 50-70% mineral oil. What is synthetics is described above, and mineral oil is a product of natural origin, obtained from oil through distillation and subsequent purification.


What does stability mean in relation to synthetic motor oil, and what does it mean for the average car owner? Synthetic motor oil is formulated with molecules whose performance has been carefully calculated. This means that this type of oil has high thermal and chemical resistance. Therefore, synthetics are much less afraid of overheating and low temperatures than other oils. It ensures safe engine operation, both in summer and winter, because it maintains optimal viscosity values ​​even when operating at high speeds and high engine load. Chemical stability means no interaction when working with oil, so its properties do not change for a long time.

Semisynthetics are more stable than mineral oil, but inferior to synthetic oil, but under certain conditions it should be preferred to synthetics. If the car has a significant mileage, then semi-synthetics must be poured into the engine, since synthetics give a high carbon content. Semi-synthetics can be safely used when the car is not operated at low temperatures (below twenty degrees Celsius), in the event that the other characteristics of the oil are suitable for this car. Semi-synthetic oil will have to be changed a little more often than synthetic one.


  1. Synthetics are less afraid of low temperatures and overheating compared to semi-synthetics.
  2. Synthetics retain their operational properties longer, protects the engine well from wear, besides, it needs to be changed less often than semi-synthetic oil.
  3. Synthetics are more fluid and penetrating, so they are able to reduce friction power losses and reduce fuel consumption.
  4. Semi-synthetics are better suited for high-performance gasoline and diesel engines, as well as turbocharged engines. It is very effective when starting a cold engine.