Certified Maintenance & Reliability Professional (CMRP) Practice Exam 2025 – All-in-One Guide to Master Your Certification!

The standard used to establish oil cleanliness targets is ISO 4406:99. This standard provides a system for classifying the levels of contamination in hydraulic fluids and lubricating oils, quantifying the cleanliness of oil in terms of the number of particles present within defined size ranges. By referring to ISO 4406, organizations can set cleanliness targets that help them meet operational performance standards, ensuring optimal functioning of machinery and extending the life of lubricants and equipment.

ISO 4406:99 utilizes a specific coding system that allows maintenance professionals to assess and report oil cleanliness and to monitor maintenance activities effectively. This is critical in contexts where equipment performance and reliability are heavily dependent on fluid condition.

In contrast, ISO 9001 pertains to quality management systems and does not specifically focus on oil cleanliness. ISO 14001 relates to environmental management, aiming at reducing environmental impact, and does not cover oil cleanliness standards. ISO 45001 is centered around occupational health and safety management systems, which, while important, do not address the specifics of oil cleanliness. Therefore, ISO 4406:99 is the right choice for establishing targets related to oil cleanliness.