Is Lower Oil Viscosity Always Better?

1 Answers
CaliRose
07/30/25 8:18am
Oil viscosity is not always better when lower. The impacts of low oil viscosity include the following 4 points: 1. Causes poor engine lubrication: Increases wear on piston rings and cylinder walls, reduces sealing performance, leading to higher oil consumption; 2. Poor sealing performance of valve seals and damage to the crankcase forced ventilation valve; 3. Crankcase ventilation port blockage: Causes excessive pressure inside the crankcase; 4. Oil cannot form a stable oil film on the surfaces of various engine components: Leading to instant generation of a large amount of heat in the engine. The composition of oil includes the following 2 points: 1. Base oil: The main component of lubricating oil, determining the basic properties of the lubricant; 2. Additives: Can compensate for and improve the shortcomings of the base oil.
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