Quote:
Originally Posted by SoCal 370Z
I have looked at the engine oil lubrication diagram in the Nissan 370Z Service Manual and it looks like (although I have not substantiated this) the oil temperature sending unit is taking its reading off the oil pulled for the oil pan. My concern is that the VVEL top-end is where the oil gets the hottest and pushed to its limits, and where a better oil temperature reading would be beneficial.
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The sump is the most logical place to read temps though as it is from that point that oil is pressurized through the system. You are probably right in that temps are probably higher at the VVEL assembly and are reduced as they drain back to the sump. This is academic though based on the failsafe trigger points. 280 in the sump may actually be 300 at the valve train, but that is where Nissan has determined the cut needs to be for the protection it needs. 300 degrees (a guess) may therefore be the "Real" number beyond which they determine the viscosity drop to be unacceptable..It looks like Viscosity levels flatten out at the 280 and beyond point...
