Quote:
Originally Posted by Daox
I'm still digging for info. In this paper, I found this info. This only pertains to the bearings in a gearbox, but it shows substantial reductions in power loss due to increasing the oil temperature, and that is with the gear oil starting at 40C / 104F, and compared to 80C / 176F.
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Maybe I missed it, but I didn't see anything in that study saying which oil is used in that test. An oil with a high Viscosity Index (VI) would show much less change in power loss due to the temperature change.
While it doesn't chart viscosity change over temperature (It does report VI though), this is an interesting study of a variety of gear lubes:
A Study of Automotive Gear Lubes
It includes both Synthetic (75W-90) and Petroleum (80W-90) lubes. While it's published by AMSOIL, after reading it I don't see that that invalidates the results.