The number after the dash indicates the oil's thickness at operating temperature. If you have an older vehicle that burns oil or has high mileage, you might need to consult a mechanic about specialized high-mileage formulas designed to condition seals and reduce leaks.
How Additives Enhance Engine Protection and Performance
This is represented by a number such as 5W-30 or 10W-40. Conversely, those in hot desert regions benefit from higher viscosity oils (10W-40 or 15W-40) that maintain a durable film under intense heat.
The "W" stands for winter, indicating the oil's cold-temperature performance; the lower this number, the easier the oil flows when you start a cold engine. Environmental and Climate Factors Where you live and how you drive significantly impact your oil choice.
How Additives Enhance Engine Protection and Performance
Conventional oil is refined from crude oil and is the most affordable option, but it breaks down faster and offers less protection under extreme stress. Similarly, direct-injection engines create more contamination, necessitating oils with superior detergency and longer drain intervals.
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