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Buying new motor oil may sound like a simple task, but there are many specifications to consider, such as SAE and API .Here's what it means
What Does SAE Mean in Oil?
SAE in motor oil stands for “Society of Automotive Engineers.” This is the group that designed the viscosity coding system for motor oils. This means the “SAE” refers to the oil viscosity specification.
Oil viscosity measures how long it takes the oil to flow through a particular container at specific temperatures. When the oil contains a higher viscosity, it takes longer to flow versus oil with a lower viscosity.
A. The First Number And “W”
The first digit in the SAE size indicates how well the oil flows at 0oF. The letter “W” is for
“Winter.” The lower this number is, the less likely the motor oil will thicken at lower temperatures.
B. The Second Number
This SAE size number indicates the oil viscosity rating at an operating temperature of 212oF. It shows how fast the motor oil thins and is crucial to proper engine lubrication and protection at a high temperature.
The higher this number is, the better the oil performs at increased ambient temperature.
If the engine heats up beyond a certain temperature threshold, the motor oil will experience a thermal breakdown and start to degrade.
API (American Petroleum Institute)
The letter "S" followed by another letter (API SP) refers to oil suitable for gasoline engines, and the letter "C" followed by another letter and number (API CK-4) refers to oil suitable for diesel engines.
So always check these ratings out when lubricating your car!