* VISUALLY EXPLAINED
Engine oil codes, often referred to as oil viscosity ratings, help users understand the characteristics of engine oils and their suitability for different operating conditions. These codes are typically represented as a combination of letters and numbers, such as 5W-30 or 10W-40. The two most common rating systems for engine oil are the SAE (Society of Automotive Engineers) viscosity rating and the API (American Petroleum Institute) service classification. Let's break down the differences between these codes:
SAE Viscosity Rating:
The SAE viscosity rating, such as 5W-30 or 10W-40, is a measure of an oil's viscosity or thickness at different temperatures.
The first number (e.g., 5W or 10W) represents the oil's viscosity in cold weather or winter conditions (the "W" stands for winter). Lower numbers indicate lighter, less viscous oils that flow better in cold weather.
The second number (e.g., 30 or 40) indicates the oil's viscosity at normal operating temperatures. Higher numbers signify thicker oils that provide better protection at high temperatures.
API Service Classification:
The API service classification, such as API SN or API CJ-4, is a system established by the American Petroleum Institute to categorize engine oils based on their performance and compatibility with specific engine types.
The letter(s) at the beginning of the API classification (e.g., "S" in API SN) signifies the application or service category. For example, "S" stands for gasoline engines, "C" for diesel engines, and "O" for other applications.
The second letter in the classification (e.g., "N" in API SN) represents the oil's performance level, with each new letter representing an improved level of protection and engine cleanliness.
To summarize, the SAE viscosity rating provides information about an oil's thickness at different temperatures, helping you choose the right oil for the climate you're in.
The API service classification, on the other hand, tells you about the oil's performance and its compatibility with different types of engines. Combining both ratings allows you to select the most appropriate engine oil for your vehicle based on factors like climate and engine type.
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