The number after the "W" is the high-temperature grade you are asking about. This number, often referred to as the SAE rating, quantifies the viscosity, or thickness, of the oil once it has reached its operating temperature.
Higher Number Oil Thicker Engine Life
In some high-performance or turbocharged engines, a higher grade number is specifically required to handle the increased pressures and temperatures generated by these advanced technologies. This makes 10W-40 thicker at high temperatures than a 10W-30, making it suitable for engines that run hotter or carry heavy loads.
A higher grade number means the oil is formulated to resist this thinning process, known as shearing, thereby maintaining a consistent and effective protective layer even when the engine is working hard. Conversely, oil that is too thin will fail to protect the engine under stress.
Higher Number Oil Thicker Engine Life
The increased thickness can help compensate for these worn clearances by creating a stronger oil film, reducing noise, and preventing leaks. Manufacturer Specifications and Modern Engines It is vital to consult your vehicle’s owner manual before making a decision about oil viscosity.
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