The American Petroleum Institute (API) classifies base oils into five groups under API 1509, based on saturates content, sulfur content and viscosity index (VI). These definitions are widely used across the lubricant industry.
The American Petroleum Institute (API) classifies base oils into five groups under API 1509, based on saturates content, sulfur content and viscosity index (VI). These definitions are widely used across the lubricant industry.
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