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Oil viscosity index improvers

Oil viscosity index improvers
Modern motor oils contain special polymer additives that act like tiny coiled springs. When the oil is cold, these molecules stay curled up and compact, but as the engine heats up, they unwind and expand to help the oil maintain its protective thickness. This is why a single oil can protect your engine during both freezing winter starts and hot summer highway driving. Without these clever additives, you'd need to change your oil type with every season like drivers did decades ago.
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