ASE Brakes Certification Practice Exam 2025 – Complete Study Resource

The National Lubricating Grease Institute (NLGI) is the organization responsible for grading the thickness of grease. It has developed a standardized system known as the NLGI Consistency Number, which classifies grease based on its thickness or consistency. This system ranges from 000 (very fluid) to 6 (very solid). The classification helps manufacturers and consumers identify the appropriate grease for specific applications, ensuring it meets the necessary performance and reliability standards required in various mechanical systems.

In contrast, the Society of Automotive Engineers (SAE) primarily focuses on developing standards related to automotive engineering, testing methods, and industry practices rather than specifically grading grease. The American Petroleum Institute (API) sets standards for motor oils and fuels but does not deal with grease consistency. Lube America is not a recognized governing body for grease grading. Therefore, NLGI clearly stands out as the authoritative organization for this specific function.