Steam Turbine Lubrication Oil regeneration with low RPVOT

Our RPVOT has reduced to @ 40% of new oil (current oil is @ 6 years old)tan and viscosity are also trending well. I'd like to know is there some kind of formula or rule of thumb that will indicate what improvement would be made if the oil had a partial replacement. Ie, remove say 30% or 50% and replenish with new oil? I assume it would not be proportional?

Regards B
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