Viskositätsklasse

Viskositätsklasse refers to a system used to categorize lubricants based on their viscosity, which is a measure of a fluid's resistance to flow. Different viscosity grades are defined by standards organizations to ensure that lubricants perform as expected under specific operating conditions, particularly temperature.

The most widely recognized viscosity classification system for engine oils is the SAE (Society of Automotive Engineers) viscosity grade. SAE grades are typically expressed as a number followed by a letter, such as 5W-30 or 15W-40. The "W" stands for "winter," and the number preceding it indicates the oil's viscosity at low temperatures. A lower number means the oil is thinner and flows more easily in cold weather, which is crucial for engine starting and lubrication during cold starts. The number following the hyphen indicates the oil's viscosity at higher operating temperatures. A higher number signifies a thicker oil at elevated temperatures, providing better protection under strenuous conditions.

Other viscosity classification systems exist for different types of lubricants and applications, such as industrial oils or hydraulic fluids. These systems may use different scales or criteria but serve the same fundamental purpose: to group lubricants by their flow characteristics to ensure appropriate performance and protection for machinery. Selecting the correct viscosity grade is essential for engine longevity, fuel efficiency, and overall equipment reliability.