The basic lubrication interval concept should be determined by...

• A. Manufacturer specifications, operating conditions, and oil cleanliness, not just time.
• B. Only by the clock on the maintenance calendar.
• C. Only by oil type.
• D. Only by the machine age.

Answer: (A)

Setting lubrication intervals relies on how the lubricant behaves under real service, not just on a fixed date. The best approach uses a blend of manufacturer specifications, the actual operating conditions, and how clean the oil is. Manufacturer specs provide the baseline interval based on the machine design, speeds, loads, and tolerances. However, real-world factors can change that quickly—higher temperatures, more dust or contamination, varying loads, or frequent startups can accelerate lubricant degradation and wear, so the interval should be adjusted accordingly. Oil cleanliness matters because contaminants and degraded oil accelerate wear and oxidation; if the oil is dirty or contaminated, the effective interval should be shorter or filtration and maintenance adjusted. Relying solely on a calendar ignores these dynamics, which is why it’s not a reliable method. Oil type influences lubrication properties but doesn’t by itself set how often you should service, and machine age isn’t a dependable signal for interval changes.