What is the limit for Viscosity changes in Engin oil under use?

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Hi Friends,

Good day to all. I wish to know what percentage of Viscosity decrease is allowable for an Engine oil in use? The percentage loss in viscosity from its intial value.

5/22/107:53 AM

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bruce381Member

API has guideline for this but as a practical limit if oil drops 1 grade

5/24/108:22 PM

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hussamadeniMember

For large engines using residual fuels one of the four parameters for changing/discarding/condemning engine oils is change is KV 40 and KV 100

1. KV 40 Plus (+) or minus (-): 25% change from original viscosity.
2. KV 100 Plus (+) or minus (-) 15% change from original viscosity.

Hussam

6/2/112:51 AM

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