Quote:
Originally Posted by modmonster
back to the thermos of hot coolant idea -does extra water in the system add to pumping losses? i remember it says somewhere on here to fill oil to minimum dipstick to reduce pumping losses.
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No. The oil level thing is due to "windage" of oil striking and being carried around inside the crankcase from the moving parts. The water pumping situation is completely different.
I like the thermos idea. I wonder why Prius did away with it???