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We use the RPVOT test on our steam turbine lub oils but only because I have to due to some archaic site requirements. I have found with back to back testing that RULER and MPC tests to be far more reliable and give more linear results (confirmed via lab testing of all three on a sample of oil to which was added increasing quantities of fresh oil).  RPVOT is to me a test used by lub manufacturers to sell you oil and they will often quote very high numbers for their oils as some kind of presumed indication of superiority.

However the RPVOT test is influenced to a large degree by corrosion inhibitors in oils which coat the copper catalyst in the RPVOT chamber and so skew the results. Overall RPVOT numbers are not as significant as the stability over time.

It is an expensive and time consuming test and one which I feel is outclassed by RULER.  MPC is a good test for varnish potential and hence oxidation and once for which the equipment required is relatively inexpensive. 

Gary

RM

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