Originally Posted by Cody winkler
It tends to run 215-220 on the highway and in traffic it runs about 225-230, I'm think of running a lower thermostat
That can be counter intuitive. The thermostat's function is maintains a minimum operating temperature. The maximum is a function of the capacity of the system to remove heat. It actually works more efficiently at higher temperatures. The maximum operating temperature is dictated by the heat being generated by the engine and the systems capacity to remove that heat.
If it were 70 degrees air temp and the water in the system was 70 degrees no heat would be removed. If it 70 degrees air temp and the water temp is 200 degrees heat is being removed. At 240 more heat is being removed. It's a self regulating system until the capacity of the system is overwhelmed. Increasing it capacity to remove heat or making less heat is the solution. Oil and transmission coolers can help.
As engines wear they become less efficient, making more heat and less power. Radiators corrode and become less efficient at removing heat. Clutches slip and create more heat. Torque converters make a lot of heat if the engine isn't producing the torque to keep them locked up.