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9 Common Misconceptions About Bearing Lubrication - Part 2

No equipment can operate without lubrication. However, in actual production, people often fall into lubrication misconceptions due to various reasons. For example, believing that any oil can provide lubrication, or that higher viscosity oil means better performance. Here are some common lubrication misconceptions for your reference.
4. Believing higher viscosity oil delivers better lubrication
Viscosity is a key indicator of lubricating oil. Its standard is usually determined at 100°C to classify oil grades. Higher-grade oils form thicker oil films, which reduce friction between contact surfaces but increase resistance. This leads to greater power loss and energy waste.When machines start up, temperatures are low. After operating for a period, the lubricating oil on friction surfaces partially drains due to temperature rise, failing to form an effective oil film. High-viscosity oil flows slowly, making it difficult to quickly replenish the friction surfaces and resulting in increased component wear.Data shows that reducing lubricating oil viscosity by 1 mm²/s can save 15% of fuel. Viscosity selection should consider factors such as operating speed and temperature. Lower viscosity in lubricating oils is currently one of the measures for fuel conservation.
5. Rigidly adhering to the oil grade specified in the equipment manual
Most equipment managers regard the oil specified by the equipment manufacturer as a rigid rule. In fact, the oil grade stated in the manual applies to general operating conditions and may not be suitable for actual working environments. The oil should be selected flexibly based on real-world usage conditions.
6. Darkening of lubricating oil indicates deterioration
The belief that darkening lubricating oil means it has deteriorated and needs replacement is one-sided. For example, it is normal for mechanical oil containing detergent-dispersant additives to darken shortly after use, and this does not mean the oil has deteriorated.
Lubricating oils with additives often form a dark protective film on bearing surfaces, and darkening during use is also a normal phenomenon. There is no need to remove the darkened lubricant. Therefore, determining whether lubricating oil has deteriorated requires comprehensive analysis, and oil should be changed based on its actual condition rather than color alone.
9 Common Misconceptions About Bearing Lubrication - Part 1
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