Originally Posted by Hobbes
When I come to a stop at the lights on the top, I can see the engine temp surge significantly... wondering if the oil cooler would help.
It will be rising because you have been going flatout and then suddenly stopped.
You have lost all the airflow through the cooler, the only thing that would help in that situation is a fan on the existing cooler, but then that would spoil the airflow when you are moving.