SAE indicates the oil viscosity grade.
VISCOSITY - is a property of the fluid that determines the fluidity of the oil. The higher the viscosity, the thicker the liquid (the lower its fluidity, the higher the viscosity). The lower the viscosity of the oil, the more it will maintain fluidity during cold temperatures when starting the engine.

VISCOSITY INDEX is a change in the viscosity of an oil as a function of temperature. The higher the viscosity index, the less the oil's viscosity depends on the temperature. Oil with a higher viscosity index has better fluidity at low temperatures (cold engine start) and higher viscosity at an already started engine.

Winter oils: SAE 0W, 5W, 10W, 15W, 20W, 25W - Identified by number and letter "W".

Summer oils: SAE 20, 30, 40, 50, 60 - Indicates number without letters.

Universal oils: SAE 0W-20, 0W-30, 0W-40, 0W-50, 0W-60, 5W-20, 5W-30, 5W-40, 5W-50, 5W-60, 10W-20, 10W - 30, 10W-40, 10W-50, 10W-60, 15W-30, 15W-40, 15W-50, 15W-60, 20W-30, 20W-40, 20W-50, 20W-60. The designation consists of a combination of winter and summer series, separated by dashes.

In cold winter conditions, engine oil must be fluid enough to start the vehicle easily and safely. T

he heated oil should be thick enough to form a large enough oil layer to protect against the premature wear of the engine rubbing against each other.

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