Also of interest, but not specifically to this discussion, from the same link:
Quote:
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Last but not least.....is the oil change out. I did a series of pulls after all the testing that we had done and got a reading of 360.4 hp, a slight and expected increase due to friction loss improvements and ring sealing (compression improvements)! I changed to Valvoline Synthetic 10W30 and did it all over again. The test revealed a 363.5, a slight improvement. But there is one other thing that I noticed that I can't explain. The regular oil was measured at a temperature during these testing cycles consistently. The synthetic showed a reduction of 9 degrees??? What?.......the thermostat was the same...the water temperature was the same. My estimation of this is that the surface/friction loss reduction diminishes the heat production and therefore the oil is cooler? Hmmmmmmmmm? I have to think on this some more. Anybody got an answer to this?
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