Actually the less viscous grades will run cooler than the heavier grades. One of the reasons is that the heavy oils have to get through the same small spaces as the lighter weight oil, which means more friction hence the higher oil pressures you see with the heavier oils. You also have a certain amount of VI improver shear in multigrade oils that also generates heat. For lower oil temperature, Oil FLOW is the key so you would run the lowest viscosity that will maintain the desired oil pressure.
Dave Ciufo
Livonia, NY
ITS 240Z #34
SM #34
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