I feel a little better now that the folks at the dealership didn't know you have an oil cooler as well. Maybe I'm not such a big dummy after all.
Unfortunately, we have some confusing information here on the forum and other sites on the web. I'm new to working on my own cars and I missed some important key points...like the fact our Pathfinders already have an oil cooler. My confusion came from the fact that an aftermarket cooler was recommended when performing the radiator bypass in the first place. I mean, there is a website about it...
http://www.savingxterras.com/node/2 I ran with what I now think is bad information and bought another oil cooler and installed it
