Capt Zoom, there are a couple of other things you also need to know. There is no thermostat to control the oil flow to the cooler. When I ride in 40F-50F weather, I have a leather rap with snaps that I put around the oil cooler because the air is so cool while riding and not needed to be cooled. The engine reaches operating temperature as normal. In the 60'sF, I start off with the rap on, and as the day warms up, I then take rap off. 70'sF and up, no rap. When I checked the engine temperature in summer months, it's normal and the cooler keeps the oil temperature stable and not cooking it. The engine does get to normal operating temperature regardless of the air temperature.