Viscosity Index Improvers

A crucial component of any multi-grade lubricant is the viscosity modifier, and it demands attention to
the quality and performance of the product during the selection process. Viscosity index improvers (VIIs)
and viscosity modifiers are polymers controlling the viscosity-temperature relationship of the lubricating
oil—they prevent oil from thinning excessively at higher temperatures, ensuring stable lubrication across
a broad temperature range.