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Viscosity Index Improvers Explained
Classification: Company News
May 29,2026
Viscosity Index Improvers Explained
Why does your 5W-30 oil work in both winter and summer?
The secret isn't just the base oil. It's a key additive called a Viscosity Index Improver (VII).
Think of them as "smart thickeners."
What they do:
VIIs are long-chain polymers that expand in heat and contract in cold. This keeps your oil viscous enough to protect at 100°C, but fluid enough to pump at -30°C.
The Problem:
Cheap VIIs break down under shear (extreme pressure). When this happens, your oil permanently thins out—leading to oil consumption (burning) and loss of protection.
The Solution:
High-quality additive packages use shear-stable VIIs. They last longer, prevent viscosity loss, and extend oil drain intervals.
We have high-quality viscosity index improvers. If you have any needs, please feel free to contact us.
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