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es. The oil itself does not increase viscosity, rather it resists decreasing viscosity below a certain level at operating temp and stays stable as possible even under extreme conditions. Below is a 10,000 times better explanation than my backwards one above, copied from here: La-Z-Link "VI Improvers are heat sensitive long chain, high molecular weight polymers that increase the relative viscosity of the oil at high temperatures. They work like springs, coiled at low temperatures and uncoiling at high temperatures. This makes the molecules larger (at high temps) which increases internal resistance within the thinning oil. They in effect "fight back" against the viscosity loss in the oil. "
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