i am using a synthetic gear oil is it should save energy in camparison of conventional gr.1 oil but how much .
can any one explain be how this can be evaluated
to get cost benefit analysis.

thanks a lot

It does not always save energy -but depends on the additive package,
There are engery meters but the indirect way is measurement of temp of bulk oil by any suitable methos and keeping other variales relatively fixed
for details we can discuss later.

Here's how you do the actual analysis:

Before you change oils:

1) Measure voltage(3-phase) & unit amps(A) for the particular piece of equipment.

2) Convert to kW = ((A)x(V)x1.76))/1000

3) Determine Hours of operation per interval

4) Identify Cost($$) per KwH from historical billing data

5) Calculate Energy Cost: (2) x (3) x (4)

Once you switch oil you can do the same calculation for the new oil.

The difference between the two is your energy savings (theoretically).