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Reply to "Are Viscosity Index Improver Polymers all that bad?"

John, EHL is full-film (elasto-hydrodynamic lubrication). Specifically, the type of film formed in a journal bearing where the shaft floats on a cushion of oil. Ring-to-cylinder, valve train and similar applications with the possibility of metal-to-metal contact are examples of boundary lubrication.

That said - there are too many variables here to make direct correlations. At a given flow rate, you can have a high oil pressure while using a low-viscosity oi because of a restriction or you can have high oil pressure with no restriction with a higher viscosity oil.

The first step in figuring out what data means is figuring out what it DOESN'T mean. Sometimes "I don't know" is the smartest answer.
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