[wprater]

I switched to a thinner oil (30 wt) after rebuilding the thermostat. Temps may have risen 5 deg, but nothing substantial.

The low temperatures per the gauge are just barely at the top of the bottom white box. I have tested the gauge grounded to see that it will achieve full range.

From what I understand, the oil will flow from the motor through the inlet of the thermostat, through the cooler and then to the closed gate on the thermostat. This is a lot of surface area for the oil to cool and keep that gate closed.

I now plan to block off 1/3 of the front surface area of the cooler with some radiator zip ties to see if that will raise my temps.