kylmäkäynnistysviskositeetti

Kylmäkäynnistysviskositeetti refers to the viscosity of an engine oil at very low temperatures. Viscosity is a measure of a fluid's resistance to flow. At cold temperatures, engine oil tends to thicken, making it more difficult for the engine to turn over and circulate lubricant during startup. High viscosity at low temperatures can lead to increased wear on engine components because oil flow is restricted until the engine warms up.

The kylmäkäynnistysviskositeetti is a critical parameter for ensuring reliable engine operation in cold climates. Manufacturers specify oil viscosity grades according to standards like SAE (Society of Automotive Engineers). For example, an oil with a "0W" designation (like 0W-20 or 0W-40) indicates very good cold-flow properties. The "W" stands for winter, and the number preceding it represents the oil's viscosity at low temperatures. A lower number signifies a thinner oil at cold temperatures, which is desirable for easier starting and better lubrication immediately after ignition.

Conversely, a higher number following the "W" (e.g., 0W-30 vs. 0W-20) indicates the oil's viscosity at higher operating temperatures. Selecting the correct kylmäkäynnistysviskositeetti is essential for preventing engine damage during cold starts, reducing fuel consumption, and ensuring optimal engine performance year-round. It directly impacts the ease with which the starter motor can crank the engine and the speed at which vital engine parts receive lubrication.