I understand that lubricity has to do with the ability of the oil to 
maintain a lubricating film under pressure.

Viscosity has to do with how readily the oil flows.

They are not related.

An early detailed study of the properties of lubricants was done by
Ricardo Engineering for the British Air Ministry in the 1920's. I'm sure 
there has been a lot done since.

Doug Woodard
St. Catharines, Ontario


On Thu, 13 Apr 2006, Keith Addison wrote:

[snip]

> ...the difference between lubricity and viscosity isn't
> that clear, or at least not to me, especially when you add high
> temperatures. Anyone know better?

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