Consequently, the numbers on a modern synthetic bottle represent a much broader and more reliable performance window than their older counterparts, allowing the engine to operate optimally in diverse conditions. Matching the Grade to Your Engine Selecting the correct oil grade is not a matter of preference alone; it is a technical requirement dictated by your vehicle's manufacturer.
Understanding Oil Viscosity Numbers and Their Meaning
Viscosity is the oil's thickness and internal friction, which dictates how easily it moves through the engine's intricate passages when cold and how well it maintains a protective film when hot. The Meaning of the Viscosity Grade The primary set of numbers, such as the "5" in 5W-30 or the "30" in the same grade, refers to the oil's viscosity, or its resistance to flow.
The High-Temperature Rating Explained While the "W" rating ensures the oil behaves in the cold, the second number—such as the "30" in 5W-30—indicates the oil's viscosity measured at 100°C (212°F). These synthetics often outperform traditional oils because they maintain their viscosity more consistently, providing better protection in both extreme heat and cold.
Understanding Oil Viscosity Numbers and Their Meaning
Multi-grade oils, which are the standard today, use additives called viscosity index improvers to allow the oil to behave as a 5W-30 across a massive temperature range. A grade of 0W flows more readily at low temperatures than a 5W, which in turn flows better than a 10W.
More About What do numbers in oil mean
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