The Owner's Manual is Law Before considering synthetic blends or high-mileage formulas, you must consult your vehicle's owner manual. The "W" stands for winter, and the number before it indicates how the oil flows at cold temperatures; a lower number means better flow and easier starting in cold weather.
Understanding the API Starburst Symbol for Engine Oil Quality
This results in superior protection, better performance in extreme temperatures, and longer change intervals. This is represented by a number such as 5W-30 or 10W-40.
Conventional oil is refined from crude oil and is sufficient for standard driving conditions and older engines. These formulations contain seal conditioners that help restore flexibility to hardened engine seals, reducing oil consumption and external leaks.
Understanding the API Starburst Symbol for Oil Quality
It is generally the most affordable option but breaks down faster and requires more frequent changes. Choose conventional for light duty and budget driving.
More About What oil for my car
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