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Purpose
To provide a general equation for finding out viscosity of lubricating oils at different temperatures and ages.
Design/methodology/approach
Based on previous works and a case study on field, a general equation was formulated which relates viscosity‐temperature‐age of lubricant.
Findings
The equation is very simple and a good consistency was found.
Practical implications
This equation will help the designers/manufacturers to recommend the correct grade of lubricating oil.
Originality/value
This type of relationship was never reported earlier.
© Emerald Group Publishing Limited
2006
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