How Do Viscosity Index Improvers Actually Work Inside an Engine?
Engines never live in one fixed temperature. They fire up cold, heat up fast, then run under loads that push oil to its limits. When oil thins too much at high temperature, metal parts lose the protection they need. When it thickens too much in the cold, circulation slows and wear increases. That constant swing creates one big challenge for lubricants. They must stay stable enough to protect the engine at both extremes.
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