What Does Engine Oil Viscosity Mean?

1 Answers
DiGage
07/29/25 10:09pm
Engine oil viscosity is a measure of the thickness of a liquid or its resistance to flow. Engine oil, also known as engine lubricant, consists of: 1. Base oil: The main component of lubricating oil, determining its fundamental properties; 2. Additives: These compensate for and improve deficiencies in the base oil's performance. The effects of excessively low engine oil viscosity include: 1. Poor engine lubrication, increasing wear on piston rings and cylinder walls, reducing sealing performance, leading to oil burning; 2. Poor sealing performance of valve seals and damage to the crankcase forced ventilation valve; 3. Blockage of the crankcase ventilation port, causing excessive pressure inside the crankcase; 4. Inability of the oil to form a stable oil film on the surfaces of various engine components, resulting in the sudden generation of a large amount of heat within the engine.
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