As the previous owner of SPF 1938, I can tell you from my experience that the
oil and coolant temps tend to run below minimally desired temps when the ambient temperature is cool. Additionally, SPF's do not come from the factory with an
oil thermostat. The solution is to install a thermostat and there are several on the market. I chose a canton one and it worked out perfectly.
Here's an image of mine as installed.
