I don't know, Cathar. 10X viscosity means a heckuva lot more umph from the pump. I remain convinced that any gain in block efficiency goes bye-bye due to overall thermal energy dumped into the system. Yeah, a really big radiator will still get you back to the same temperature regardless of the pump power, but it gets outside the range of "practical".
From the standpoint of delving into the deep end, by all means have at the experiment. I'll be shocked if it represents any sort of practical application. Then again, when has original research ever had much to do with being practical? Best luck on the experimenting and keep us posted.
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