These additives reduce oil consumption and minor external leaks, while detergents keep internal surfaces clean. Environmental and Fuel Economy Considerations Low-viscosity synthetics have become popular as automakers design engines specifically to meet stricter fuel-economy targets.
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Synthetic vs Conventional Oil: What Really Matters Conventional oil is refined from crude petroleum and provides basic lubrication at an affordable price, yet it can break down faster under severe conditions. Practical Tips for Changing and Choosing Oil.
Additives called anti-wear agents create a protective layer even before the oil reaches operating temperature, reducing scuffing and extending engine life in stop-and-go traffic or short daily trips. The number after the dash reflects thickness at operating temperature, where higher numbers maintain stronger oil films under heavy loads and high speeds.
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For mostly highway cruising in moderate climates, a well-formulated conventional or synthetic blend may offer excellent value while still protecting critical components. Viscosity and Temperature Management Viscosity, expressed as a code such as 5W-30 or 0W-20, describes how easily oil flows at different temperatures.
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