Engine oil viscosity

Viscosity refers to the fluidity of an oil. Oil viscosity decreases with temperature. As the temperature rises, it liquefies. This negatively affects the adhesion to the surface and the strength of the lubricating film. As the temperature decreases, it becomes thick, while the viscosity and internal friction resistance increase. These properties require the use of an oil whose viscosity changes as little as possible with temperature. When the engine is cold, the oil must be thin enough not to overload or impede the operation of the starter and to reach all lubrication points as quickly as possible. Viscosity and internal friction of an oil are one and the same, and are indicated by the SAE system (Society of Automotive Engineers), cook e.g. SAE30, SAE 10, etc. A high SAE number indicates a thick oil. However, the viscosity cannot be used to judge the lubricating properties of the oil.

All-weather oil

For OPEL KADETT D, you can use seasonal cooker, current and all-weather oil. All-weather oils have an advantage, because they are suitable for both winter and summer. All-weather oil is made on the basis of low-viscosity seasonal oil (e.g. 15W) Thanks to the current called thickener, the oil is stabilized when hot, so that under any operating conditions it gives the required lubricating properties (e.g. 10W-40, 15W-50). Letter "W" indicates that the oil can be used in winter.

All-weather oil with enhanced anti-friction properties (light water)

It is an all-weather oil with additives to reduce the coefficient of friction, which increases fuel economy by 2%. These oils have a low viscosity (e.g. 10W-30). They require an unconventional foundation (synthetic oil). Gliding oils must meet the API specification.

Application/Viscosity grades

Because The fields of application of oils intersect, short-term temperature drops are acceptable. It is also acceptable to mix oils of different viscosities when topping up, or when the air temperature does not match the viscosity of the filled oil. At long-term temperatures below -20°C (arctic region) SAE 5W20 oil is recommended.

Additives of any kind do not need to be added to either the fuel or the oil.

Engine oil specification

The quality of the oil is classified using the API system (API = Amehcon Petroleum Instilut). European manufacturers are also guided by this system. The name oil must contain two letters. The first letter defines the field of use S=Service, suitable for petrol engines, C=Commercial. suitable for diesel engines

The second letter defines the quality in alphabetical order.

The following API specification oils are of the best quality: SG for gasoline engines, CD for diesel engines.

Attention: CD oil, which manufacturers recommend exclusively as oil for diesel engines There are oils that are suitable for both gasoline engines, current and diesel engines. In this case, the symbols are indicated on the container (e.g. SF/CD).

For OPEL KADETT, SG API specification oils are recommended, SF oils are acceptable.