What does an increased viscosity in lubricating oil typically indicate?

Petroleum Refinery Engineering MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
Petroleum Refinery Engineeringchemical-engineering › petroleum-refinery-engineering
Published
1 Mar 2019
Last updated
28 May 2026

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Explanation

A higher viscosity in lubricating oil is generally associated with an increased flash point and fire point, meaning the oil can withstand higher temperatures before igniting. Lower Reid vapor pressure and higher acid number are unrelated to viscosity changes.

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